Machsupport Forum

General CNC Chat => Show"N"Tell ( Your Machines) => Topic started by: zafarsalam on September 18, 2013, 01:43:11 AM

Title: Prima Lathe conversion
Post by: zafarsalam on September 18, 2013, 01:43:11 AM
This is the one I longed to do for a long time. Prima is one of the finest brands of Lathes produced in Pakistan. Last week a customer asked if I would do a CNC conversion on his one year old Prima. Yesterday it arrived here in my workshop and already stripped off of it's gears, lead screw, feed rod, feed carriage, end brackets and all. Over the course of one month we are going to install AC servos, ball screws, limit/home switches, VFD, Spindle Encoder, Smooth Stepper, and of course Mach3. I will try to document it (which is always a hard job for me :) ). Here is a photo of the stripped down machine.
Title: Re: Prima Lathe conversion
Post by: DICKEYBIRD on September 18, 2013, 09:06:16 AM
Over the course of one month we are going to install AC servos, ball screws, limit/home switches, VFD, Spindle Encoder, Smooth Stepper, and of course Mach3.
You folks have 78 hour days over there?

Just kiddiing; I'm sure you'll "git 'er done" as planned.  I do hope you find time to document the build as I have really enjoyed your previous threads.:)
Title: Re: Prima Lathe conversion
Post by: zafarsalam on September 18, 2013, 10:16:54 AM
Motors, drives and VFD inverter are here. 750W AC servos, 2.2 kW sensorless vector inverter. Have to arrange for their enclosure cabinet and the front panel box tomorrow. Also have to design the ball screws mounting fixtures in CAD. The x-axis slide has too little space beneath it to fit a ball nut. I am thinking about a rotating nut mechanism for x-axis. Timing belts and pulleys for coupling motors to screws. Angular contact bearings for the screw ends. We are going to need 78-hour days ;).

Title: Re: Prima Lathe conversion
Post by: khalid on September 18, 2013, 12:46:28 PM
Hi Zafar,
Great .. Love to see it operational within a month..This seems not a big project;)
Title: Re: Prima Lathe conversion
Post by: zafarsalam on September 18, 2013, 01:21:07 PM
This seems not a big project;)

This is not going to be as big or complicated (I hope) as the one we did together. It will be as much fun, that's for sure. Fun is the thing that drives us after all :)

Zafar
Title: Re: Prima Lathe conversion
Post by: Hood on September 18, 2013, 04:27:41 PM
Looking forward to seeing this as well :)
I like to see lathes getting done, in fact I will be helping a friend retro a Beaver TC15 soon.

Hood
Title: Re: Prima Lathe conversion
Post by: khalid on September 19, 2013, 02:37:51 AM
I do know you are presently involved in too many projects. If i consider this project  "one and only" in your hand then i bit definetly you will do it within 10 days.
Alas... I wished my hobby relevant to my job :( i also wana feel like you ...
Title: Re: Prima Lathe conversion
Post by: zafarsalam on September 24, 2013, 12:23:44 AM
The motion controllers from cncdrive.com arrived yesterday. UC300 goes into this one. UC100 is for another machine. This is going to be my first experience with cncdrive's motion controllers. I've read good reviews about it and with my experience with Balazs, I am confident that it will go along well like his other products.

Zafar
Title: Re: Prima Lathe conversion
Post by: zafarsalam on September 25, 2013, 04:03:07 AM
Enclosures for drives, inverters, PC, screen, keyboard etc. have arrived too. Have to cut them for cable glands, vents, cooling fans and mounting brackets. Then send them to the paint shop. Another two days work. Almost all the hardware is here. Just the bearings are remaining. Two sets of angular contact bearings and a deep groove ball bearing. Then the machining work will start for the mounting brackets.

Zafar
Title: Re: Prima Lathe conversion
Post by: khalid on September 25, 2013, 05:31:38 AM
Zafar seems this time you are not using SmoothStepper ;) Can you please share the advantages of using UC100 over smoothstepper. Price of UC100?
Title: Re: Prima Lathe conversion
Post by: zafarsalam on September 25, 2013, 05:48:07 AM
Khalid,

The SS-USB gives two parallel ports worth of I/O's and SS-Etherenet give three PP's. On the other hand UC100 is a very compact size (just the size of a 25 pin connector cover) and gives just one PP. UC300 gives you 5 PP's worth of I/O's. UC300 also gives you two analog inputs and two analog outputs with these. I am using UC for their superior support for I/O's. A machine under development here in Karachi needs 46 I/O's so I went for the UC series. Price of UC100 is 80 Euros and for UC300 is 105 Euros. If you need one, do let me know. I am going to order a few in weeks to come.

Zafar
Title: Re: Prima Lathe conversion
Post by: khalid on September 25, 2013, 06:28:56 AM
Thanks for the offer... I have purchased Gecko few year back and now fabrication CNC router.. I feel no need to purchase the UC or smooth stepper for the time being nor i have knowledge how to use them.. Getting old and office work is getting tough and tough and unfortunately not related to my hobbies..
I want to quit myself from Stepper stuff and want to get acquaintance about servos but the price of servos are too high so far.

I really love your work and you are literally one of the honest and technical giant in this field i know.. May be someday you be my mentor;)
Title: Re: Prima Lathe conversion
Post by: zafarsalam on October 08, 2013, 11:44:03 AM
Drives enclosure, PC enclosure, pedestal etc. are back from the paint shop. Here they are after some assembly. The front plate engraving is in progress at this time. Ball screws and servo motors assembly fixtures will start getting machined tomorrow.

Zafar
Title: Re: Prima Lathe conversion
Post by: zafarsalam on October 09, 2013, 09:42:30 PM
Here is the PC front panel after fitting all the stuff.

Title: Re: Prima Lathe conversion
Post by: zafarsalam on October 11, 2013, 03:57:40 AM
Replacing x-axis acme lead screws with a ball screw is always difficult for conventional lathes. I had to replace a 5/8" lead screw with a 15 mm ball screw. The nut wouldn't fit in the recess on the x-axis saddle. Ended up with machining off one end of nut mounting flange and machining a pocket in the slide to accommodate the other flange. The recess in the saddle had to be machined 1 mm at one side.
Title: Re: Prima Lathe conversion
Post by: Hood on October 11, 2013, 05:53:28 AM
Looks to be quite a course pitch on the ballscrew.
Hood
Title: Re: Prima Lathe conversion
Post by: zafarsalam on October 11, 2013, 06:14:35 AM
Yes, it's 10mm pitch. Rather coarse for the cross slide. But it was the best I could get without waiting. I am going to put a 1:2.5 reduction on it through timing pulleys.

Zafar
Title: Re: Prima Lathe conversion
Post by: Hood on October 11, 2013, 06:18:52 AM
Ah ok, its not as much as I thought, looked to be 16mm or so from the pic, maybe just because of the smaller dia

Hood
Title: Re: Prima Lathe conversion
Post by: khalid on October 30, 2013, 09:54:07 AM
wow..nice control panel. I am looking for more pictures.
Title: Re: Prima Lathe conversion
Post by: vre on November 30, 2013, 03:10:22 AM
Sorry for the of topic (if there is a problem please delete it)
Hello!
Iam new member and i want to convert my lathe like yours.
I haven't done any cnc conversion before and i need some help.
I have a lathe like that http://images.ua.prom.st/28306498_w640_h640_27032013431.jpg with 2.2kw 3phase spindle motor and 1.4m z axis distance.
I want to buy for x and z axis 2 servo motors+drivers or 2 stepper motors+drivers but i don't know what motors and drivers to choose(power/rmp/torque).
If i put servo motors i will need reduction by pulleys and timing belts but what ratio reduction will be optimal ?
For spindle what encoder will be ok ?
thank you.
Title: Re: Prima Lathe conversion
Post by: zafarsalam on November 30, 2013, 11:05:13 AM
I would select the ball screws first. For a machine this size, 25 - 30 mm dia ball screws would be suitable. A pitch of 5 to 10 mm would fine too. Install the ball screws on your x and z slides and then measure the torque that is needed to turn the screws. Servo motors are selected after you have the required torque and the desired max. rapid feed. For conventional slides that have metal to metal contact, I normally don't go above 5000 mm/min. So if you have 3000 rpm servo motors and a 5 mm pitch ball screw, the timing pulley reduction to get 5000 mm/min rapids would be 1:3. And if the calculated torque is 6 N-m then for a 1:3 gear reduction you'll need 2 N-m on the motor shaft. A 2 N-m, 3000 rpm servo motor would be roughly 750W. This is normally the size of motors on machines this big. The spindle encoder mach3 needs is single pulse per revolution. If you are going for the parallel port setup then make sure that your index signal is long enough for mach to read. With external motion controllers you normally don't have to worry about the index pulse width.
Title: Re: Prima Lathe conversion
Post by: vre on November 30, 2013, 08:11:30 PM
Thank you very much for your reply.
Because is not easy for me to make torque tests because if i disassemble the lathe and install ballscrews i will not have machine to make the modifications so from your experience this selection will be ok ?
for z axis: 32mm diameter 5mm pitch ballscrew 750w/3000rpm yaskawa/mitsubishi servo with reduction 1:3
for x axis:16mm diameter 5mm pitch ballscrew 400w/3000rpm yaskawa/mitsubishi servo with reduction 1:3

If i put steppers this will be ok?
for z axis: 32mm diameter 5mm pitch ballscrew nema42 4200oz with reduction 1:2
for x axis:16mm diameter 5mm pitch ballscrew nema34 1600oz with reduction 1:2

On your machine how much is the torque for z and x axis ? I will suppose that in my machine the torque will be 1.5 times higher than yours...

I will go with parallel port this encoder will be ok ?
http://www.ebay.com/itm/Optical-Endstop-Switch-for-CNC-3D-Printer-RepRap-Makerbot-Prusa-Mendel-RAMPS-1-4-/400545910883?pt=LH_DefaultDomain_0&hash=item5d42659063
Can i put with some hack to mach3 an incremental optical rotary encoder for better resolution or not ?
Title: Re: Prima Lathe conversion
Post by: zafarsalam on November 30, 2013, 09:23:05 PM
Your selected hardware seems ok. The motors on my machine are both 750 W with 1:2 reduction. They run fine with 3000 acceleration in Mach3. I didn't calculate the torque on the screws on this one. Your selected encoder will work fine. Just use a single slotted disk and make sure that the slot is wide enough for parallel port to read. For a spindle running at 1500 rpm max. the slot should be at least 45 degrees wide. You'll have to experiment with it a little. Mach3 won't read the optical incremental encoder at high speeds if it's a fine pitch. And the threading option in Mach requires single pulse per revolution.
Title: Re: Prima Lathe conversion
Post by: vre on December 11, 2013, 02:39:23 PM
Iam planning to use these drives with matched servos without reduction
http://www.ibuyla.com/Product/14836946575/

What breakout board to suggest me supporting
>=4 axis
>=6 optical endstops
1 optical spindle sync endstop
option to control spindle speed with vfd
manual operation with joystick & jog speed control
option to switch on/off cooling fluid (to switch oil solenoid electric valve )
emergency stop
points in cutting tool
pause or reset cutting operation
ability to control tool turret

It doesn't matter the if is parallel or usb
Are these ok ?
http://www.ebay.com/itm/USB-5-Axis-CNC-Breakout-Board-Interface-Adapter-For-Stepper-Motor-Driver-/321133023129
http://www.aliexpress.com/item/4-axis-USBCNC-breakout-board-interface-board/1015011998.html

Iam planing to buy from ebay or aliexpress.

thank you
Title: Re: Prima Lathe conversion
Post by: zafarsalam on December 12, 2013, 01:59:13 AM
Sorry, I don't have experience with commercial break out boards. I design my own break out boards for each project I make.

Zafar
Title: Re: Prima Lathe conversion
Post by: vre on December 12, 2013, 02:06:58 AM
the breakouts witch is for stepper drivers work with servo drivers ?
Title: Re: Prima Lathe conversion
Post by: zafarsalam on December 12, 2013, 05:08:49 AM
Yes they will work for steppers too. Just make sure that you can connect the drive error signals through the BOB too. Normally we connect it to the external e-stop.

Zafar
Title: Re: Prima Lathe conversion
Post by: khalid on December 12, 2013, 06:31:31 AM
Zafar Brother.. You are a legend:).. Really love your skills and knowledge. You are a true engineer:)
Title: Re: Prima Lathe conversion
Post by: khalid on December 16, 2013, 08:56:02 AM
Zafar Brother, do you have UC100 available. I want to test it with my G540.
Title: Re: Prima Lathe conversion
Post by: zafarsalam on December 16, 2013, 09:42:42 AM
Zafar Brother, do you have UC100 available. I want to test it with my G540.

Sorry Khalid. It got installed in a machine last month. I'll let you know when I get a few more. UC-300 are available at this time though.

Zafar
Title: Re: Prima Lathe conversion
Post by: khalid on December 16, 2013, 11:53:56 AM
Brother, UC300 is bit expensive. I want to know wether UC-100 will work with my Gecko G540 ?... Presently i am running Mach3 at 25KHz and due to limitation i can run my new router at 400IPM without any vibrations/damage. Using 25KHz i can not increase my velocity more than 400IPM. If i increase my Kernel frequency say 100KHz using UC100 i can gain a little more speed say upto 1000IPM. This will be my rapid...
Title: Re: Prima Lathe conversion
Post by: zafarsalam on December 20, 2013, 09:51:46 PM
The lathe retrofit is complete. Getting 0.001 resolution on both the axes and 5000 mm/min rapids. Using Delta servo motors/drives, Delta spindle encoder and VFD, UC300 motion controller, Euchner MPG, custom designed break out board and of course Mach3. Designed new screens for it and using MPG for FRO and SSO. That's it. Here's a photo.
Title: Re: Prima Lathe conversion
Post by: Hood on December 21, 2013, 04:30:13 AM
Looking great :) and performance sounds excellent as well.

Hood
Title: Re: Prima Lathe conversion
Post by: khalid on December 21, 2013, 09:22:55 AM
Love to see more screens pictures :).. Nice work.
Title: Re: Prima Lathe conversion
Post by: RICH on December 21, 2013, 06:44:47 PM
Nice job.
Since I am only 3'-6" tall i would need an adjustable stand for the screen, but then, your not building it for me.  :D ::)

RICH
Title: Re: Prima Lathe conversion
Post by: khalid on December 21, 2013, 11:42:17 PM
Rich,
Is that you in your avater?
Title: Re: Prima Lathe conversion
Post by: zafarsalam on December 22, 2013, 01:26:38 AM
Nice job.
Since I am only 3'-6" tall i would need an adjustable stand for the screen, but then, your not building it for me.  :D ::)

RICH

You can use the same stand which you do for operating the lathe :). Have a nice day.
Title: Re: Prima Lathe conversion
Post by: RICH on December 22, 2013, 06:49:19 AM
Is that you in your avater?
Nope, the figure is too tall.  :D   It was "gifted" to me a long time ago, so out of appreciation, I kept it.

zafarsalam,
Have lots of portable stands for running machines. One extends to the roof of my house.  ;) :D
So what's the next conversion?

RICH


Title: Re: Prima Lathe conversion
Post by: vre on December 22, 2013, 10:53:08 AM
Perfect!
The next step is to install automatic tool change turret.. check to aliexpress/alibaba have some cheap-simple chinese auto turrets.
I want to ask you what ballscrews have installed and how much reduction you have ?
Are the rapids 5m/min fast for common applicatons or if it was faster will be better?
I ask you this because i have ordered higher power servos so i have enough torque
to run at higher speed... but higher speed that 5m/min is usable ?
Title: Re: Prima Lathe conversion
Post by: zafarsalam on December 22, 2013, 11:43:55 AM
vre,

I had limited choice for the ball screws. With this setup I can go upto 20,000 mm/min but it is too much for conventional metal-to-metal contact slides here. So I limited it to 5,000 mm/min to minimize wear on slides. Finer pitch ball screws would have been better here and I could go with less powered servos. With extra power on servos, I can get a high acceleration rate which is useful in machining coarse pitch threads.

Zafar
Title: Re: Prima Lathe conversion
Post by: DICKEYBIRD on December 23, 2013, 10:05:30 AM
Wow, the overall look of the finished lathe is so simple & uncluttered Zafar!  A sign of great design & engineering.  (...but we knew that already.)

I really like the covers you've made for the carriage & servo mountings.  How did you make them?  I can't tell from the picture; are they machined from large plastic blocks or....?  That must've been a large project by itself! :o

I noticed it still has the compound fitted and a 4-way tool post.  Is it up to the customer to fit his own QC tool system or ATC?

Thanks very much for taking the time to post your work Zafar but we need more pictures and details to feed our lathe lust! ;D
Title: Re: Prima Lathe conversion
Post by: zafarsalam on December 23, 2013, 01:30:06 PM
Dickeybird,

The covers are sheet metal with powder coating. Bent and welded with hand tools. Customer is contended with this tool post at this time. I have offered him a Chinese turret tool post though. I'll post more photos after customer's training on it is complete.

Zafar
Title: Re: Prima Lathe conversion
Post by: vre on December 27, 2013, 05:08:53 AM
What ballscrew/ballnut(is better single or double ?)/pulleys/timing belt have you used for Z axis ?
Do you know some tutorial/webpage how to design a breakout board ?
I have some knowledge in electronics so i believe that i will do it myself..
Title: Re: Prima Lathe conversion
Post by: vre on December 28, 2013, 07:51:02 AM
I see that you have a big transformer in the box.
What doing this transformer ?
If the drivers are 3 phase 230Vac and my supply is 3 phase 400Vac or 1 phase 230Vac what can i do ?
3 phase transformer 400Vac to 230Vac of 1 phase 230V conected L1-phase L2-neutral L3-phase and add extra electrolytic caps after the bridge in driver ?
Title: Re: Prima Lathe conversion
Post by: zafarsalam on December 31, 2013, 09:47:12 AM
vre,

The transformer is for getting 220V from 380V mains. The drives and the PC can run from 220V single phase, but I didn't want to introduce a neutral phase into the system to avoid line fluctuations. That's why the three phase transformer is there. Nut on my Z axis screw is single and on the x axis is double. No big reason behind that besides they were the only ones available at the time of assembly. For breakout boards I'll ask my friend Nooruddin, who did the electronics mumbo jumbo, for any tips.

Zafar
Title: Re: Prima Lathe conversion
Post by: vre on February 19, 2014, 04:28:04 PM
What type pulleys/timming belts have you used ?
Have you any backlash with these pulleys/timing belts ?
Finally reduction is 1:2 and ballscrews 10mm pitch on both axis ?
Title: Re: Prima Lathe conversion
Post by: zafarsalam on February 21, 2014, 11:16:36 PM
What type pulleys/timming belts have you used ?
Have you any backlash with these pulleys/timing belts ?
Finally reduction is 1:2 and ballscrews 10mm pitch on both axis ?

I am using 3/8" pitch L sized belts and pulleys. No backlash. 1:2 reduction on both axes. 10 mm pitch on ball screws.

Zafar
Title: Re: Prima Lathe conversion
Post by: vre on February 22, 2014, 05:10:15 AM
The 10mm pitch ballscrews have good accuracy from your testings ?
Or would be better with 5mm ballscrews and 1:2 reduction ?

With this setup you have 15m/min rapids  is this speed in usable range or it is so much for conventional prismatic ways ?
Title: Re: Prima Lathe conversion
Post by: zafarsalam on February 22, 2014, 08:58:42 PM
The 10mm pitch ballscrews have good accuracy from your testings ?
Or would be better with 5mm ballscrews and 1:2 reduction ?

With this setup you have 15m/min rapids  is this speed in usable range or it is so much for conventional prismatic ways ?

You are right. The max rapid is too much for the conventional ways. I have fixed it to a slower 5000 mmpm. A 5 mm pitch screw would be better for this machine.
Title: Re: Prima Lathe conversion
Post by: vre on March 09, 2014, 11:58:38 PM
My ballscrew is 2m 32mm diammeter and from this calculator http://www.nookindustries.com/EngineeringCalculator/MetricCriticalSpeed (30mm root/Length 2000mm/type B fixture)
the critical speed before ballscrew begins to oscillate is 907 rpm so would be better to take 10mm pitch ballscrew to get the desired rapids without the risk of oscillation ?

Also what end supports do you have for Z and X axis ? Iam planing to put for Z bk25/bf25 and for X fk12/ff12 is that ok ?
Title: Re: Prima Lathe conversion
Post by: zafarsalam on March 10, 2014, 03:59:53 AM
My z axis ball screw is almost 900mm. I am using deep groove ball bearing at the free end. The x axis screw has no end support. It is just 250mm long. You can also try the rotating nut mechanism similar to the one used in early Bridgport series I CNC mills.
Title: Re: Prima Lathe conversion
Post by: vre on March 24, 2014, 01:22:00 AM
thank you!
I have checked the rotating nut mechanism it can give better column strength and better critical speed with the
caveat that the Z axis servomotor must be fixed to carriage and move together with carriage.
(I also found that some high end machines use hollow shaft servos for direct driving the ballnut )
My Z axis servo is 8kg so it is too much to move x & z axes motors with carriage.

So I have 2 solutions remaing
1) Bigger diameter Z axis ballscrew (40mm) to overcome column strength and critical speed.
I have a dilemma if i would use 32mm or 40mm diameter ballscrew because both ballscrews fulfill the critical speed but the 32mm has about 2900kg column strength and my servo can give force about 3500kg the 40mm fulfills both critical speed and column strength force but has about triple inertia of 32mm ballscrew and this will degrade much the performance.
 
2) Do not use a ballscrew but the rack pinion mechanism that lathe has for semi-auto feeds.
This would be inaccurate and will have a lot of backlash but it will not have the the problems of critical speed & column strength
From that i can see this lathe which is very long uses this method http://www.youtube.com/watch?v=E-F5vgQnKVg
(or uses a ballscrew ? i can't see clearly)

Your Z axis ballscrew is 900mm and 10mm pitch but what diameter ? 20mm 25mm or 32mm ?
Title: Re: Prima Lathe conversion
Post by: zafarsalam on March 24, 2014, 05:44:40 AM
I guess the most cost effective solution would be to go with the 40mm screw. Mine is 32mm. Extra inertia will result in slower accel and decel rates. Rack and pinion would be ok if you use a linear scale on the z-axis and use servo drives that can handle two encoder inputs (like Delta A2 series servos). You'll have to mount the servo with a gear box to the slide carriage for rack and pinion mechanism.

Zafar
Title: Re: Prima Lathe conversion
Post by: Hood on March 24, 2014, 06:41:42 AM
JFYI my lathe has a 2m long, 40mm dia 5mm pitch ballscrew on Z. It is supported both ends and I have my Velocity set to 10m/min and accel 800mm/s/s. I previously ran at 15m/min with no problem but reduced to 10m/min as I thought that fast enough.

Hood
Title: Re: Prima Lathe conversion
Post by: vre on March 24, 2014, 11:07:33 AM
Hood
From this calculator http://www.nookindustries.com/EngineeringCalculator/MetricCriticalSpeed with 2000mm length 4005 ballscrew (36mm root diameter)
with type c end support the critical speed is 1600rpm so 1600rpm x 5mm = 8000mm/min.
How you get 10m/min and 15m/min rapids without whipping problem ? Maybe the calculator is wrong and calculates with big safety factor ?
Title: Re: Prima Lathe conversion
Post by: Hood on March 24, 2014, 12:52:49 PM
The actual length of screw free of the bearings is approx 1700mm on my lathe and I certainly dont have issues with whipping.

The length of the screw on my Chiron FZ12S is approx 900- 1000mm outside of the bearings, its only supported at 1 end and spins at 2000rpm (10mm pitch and 20M/min rapids), the calc says about 1200-1500rpm.
 I think Chiron will know what they are doing seeing as their machines are top end and as the machine is 27 years old I think it would have had issues before now if they were wrong.

Hood

Title: Re: Prima Lathe conversion
Post by: vre on March 24, 2014, 03:46:45 PM
I measured again and the shortest length of screw i can put between bearings in my lathe and is 1750mm.
I will put 10mm pitch ballscrew but i have not decided for diameter 32mm or 40mm.
32mm has lower column strength but has lower inertia so better acceleration also is cheaper.
40mm has better column strength (almost double) but much higher inertia (almost tripple) so worse acceleration also is more expensive.
Critical speed is ok in both cases.
In Z axis i will use 1.8kw servo 3000rpm with reduction 1:3 so i will have max 1000rpm to ballscrew with 10mm pitch rapids will be 10m/min.

If it was your lathe what diameter would you install 32mm or 40mm ?
Because this size ballscrew has some cost i dont want to make a false selection.
I want just your opinion 3210 or 4010 ballscrew ?
thank tou! 
Title: Re: Prima Lathe conversion
Post by: Hood on March 24, 2014, 04:46:36 PM
I dont know what size your lathe is, mine is fairly big, the carriage, I suspect, (with the turret) would weigh in about 6-800Kg.
Hood
Title: Re: Prima Lathe conversion
Post by: vre on March 24, 2014, 06:04:15 PM
My lathe is the same with this http://images.ua.prom.st/28306498_w640_h640_27032013431.jpg
but has 400mm more z axis length mine is 1400mm between centers
and the lathe in photo is 1000mm between centers but all the others are the same
My lathe has total weigth 1250kg

(to correct my previous post 40mm ballscrew has x1.6 inertia of 32mm ballscrew not tripple)
Title: Re: Prima Lathe conversion
Post by: Hood on March 24, 2014, 06:25:33 PM
That lathe looks a similar size to  a Colchester Triumph and the saddle looks to be relatively light in comparison to the one on my lathe.
Below is a pic of my lathes original front toolpost with a Colchester Triumphs toolpost sitting on top to give an idea of scale. The boring bar in the toolpost is 32mm dia.
I would think the 32mm dia should be enough for a lathe your size if 40mm is on mine and works fine.
You may be able to get the length of the ballscrew down even shorter if you can mount the ball nut to the front of the carriage, that way you could have the end bracket in a bit from the end of the lathe bed.

Hood
Title: Re: Prima Lathe conversion
Post by: vre on April 01, 2014, 02:41:56 PM
thank you!
i will go with 3210 ballscrew
Title: Re: Prima Lathe conversion
Post by: jlbs00 on December 13, 2017, 02:21:23 AM
Hi zafar,
Can u give me details of wiring diagram and signals between uc300 motion controller ,mach3 and delta asda-b2.
I m kinda new to cnc ,will really be thankful if you can provide me with details.
Thx and regards