Messages

151

General Mach Discussion / Arrow Keys Failed to Jog- No problem with Keyboard keys in Other Applications

« on: June 04, 2010, 10:02:50 AM »

I am having a strange problem today.. My Keyboard Arrow Keys failed to Jog the Motors...even the 'Page Up' and Page Down' keys didn't moved my Z-axis motor...I have done following more test:

a) I checked the System Hotkeys Setting in Mach3 and they were defined correctly for all Axes.
b) I open a Notepad and wrote some paragraph and Scrolled each Alphabets with Keyboard Arrow keys and they worked perfectly.
c) I have made a quick test to see if all axis are working is to issue some G0 commands on the MDI page of Mach3.  I typed G00 X2 Y4 Z6 and entered and all motors moved to its locations.

From a decade i am using the same Keyboard and the Arrow keys working perfectly in other applications but why it failed today?..Any idea or suggestions?

152

General Mach Discussion / Re: NEW Mach forum subject

« on: May 28, 2010, 07:22:34 AM »

Agreed...

153

General Mach Discussion / Re: What Steps/ Units Settings for Z-axis (Quill) of CNC Retrofitted Radial Machine?

« on: May 28, 2010, 07:13:47 AM »

Thanks Hood...I wish i could have 20 degree celcius here.. yesterday we have 53 degree celcius.. I adjusted the POT on the modular card to 2.5Amp current.. Although i have 4Amp setting for high torque but the Ambient temperature is too high.. So I am running these beefy motors with 30% of their torque curve:(...

yesterday, i made some progress.. Following are the mock-up results of tube sheet drilling for one of our exchanger..
Program used:
1-AutoCad
2-VisualMill 5
3-Mach3

The feed was calculated for
1- Dormer centre drill A-201 HSS
2- Spindle RPM: 800
3- Cut feed: 215mm/min

Total holes: 220 Ea
Time         :52Minutes

New Pictures:
http://www.cnczone.com/forums/attachment.php?attachmentid=107978&d=1275044769
http://www.cnczone.com/forums/attachment.php?attachmentid=107979&d=1275044769
http://www.cnczone.com/forums/attachment.php?attachmentid=107975&d=1275044769
http://www.cnczone.com/forums/attachment.php?attachmentid=107976&d=1275044769
http://www.cnczone.com/forums/attachment.php?attachmentid=107977&d=1275044769

154

General Mach Discussion / Re: What Steps/ Units Settings for Z-axis (Quill) of CNC Retrofitted Radial Machine?

« on: May 25, 2010, 10:58:27 AM »

As per HOOD instruction, I checked the Auto-Feed option on the radial drill...I found three speeds setting .. 0.06mm/rev , 0.21mm/revolution and 0.1mm/revolution... I have disabled the AutoFeed gearing and used 0.06mm/revolution worm set only.. I have to make new motor mount too.. I will soon post the pictures of the setup.. Now not only i will get the resolution on the Quill but the greater torque...

In the couple of days i will show some drilling work on Actual tubesheet of the exchanger:)...  Here in my Shop the Ambeint temperature shoot 49Celcius... yaa man it is in Celcies not in Farhenhite ..One of my controller have Heart Attack (Thermal Shutdown)..Now I am going to arrange some Cooling setup for the controller panels too;)

Thanks Hood and all the folks who solved my problems....

155

General Mach Discussion / Re: What Steps/ Units Settings for Z-axis (Quill) of CNC Retrofitted Radial Machine?

« on: May 23, 2010, 03:07:43 AM »

Ian, I agree with you:) Using smaller Stepper is better comparing to bigger..This is my experience too...
Hood.. You are absolutly right.. The Pinion-Rack are very coarse and my whole torque increment is reduced by this rack component... I am going to install worm-wheel of 30:1 ratio or a little higher 50:1 to get maximum Torque to drill and mill CS and Stainless plates..

I am giving links of completed machine with some Failed drilling pictures.... You will see I couldn't get the drill 1mm inside carbon steel plate.. The Drill is of HSS brand new DORMER make...
http://www.cnczone.com/forums/attachment.php?attachmentid=107676&d=1274598084
http://www.cnczone.com/forums/attachment.php?attachmentid=107679&d=1274598084
http://www.cnczone.com/forums/attachment.php?attachmentid=107678&d=1274598084
http://www.cnczone.com/forums/attachment.php?attachmentid=107677&d=1274598084

156

General Mach Discussion / Re: What Steps/ Units Settings for Z-axis (Quill) of CNC Retrofitted Radial Machine?

« on: May 22, 2010, 09:00:18 AM »

Hi Ian..The Gearing for the Z-stepper Motor gives Torque:
1200 Oz-in Bipolar Mode, I am using it in Unipolar so Lets say I am getting 600Oz-in Torque straight away from the Motor..
Now , 600 x 3 =1800Oz-in torque at the Feed shaft.. So do you feel good at  this Torque for drilling hole in 30mm thick Carbon Steel Plate...
Following were my setting for Z-axis  Motors

Steps/Unit= 12.33   , Velocity=10mm/min  and Acceleration=5mm/min/min
200 steps, 1/2 step Mode, 3:1 Reduction Pully and further Rack/Pinion..

The Brand New HSS 2flute drill 7.8mm DORMER, Following were the Feed and speed
Spindle RPM= 900
Plunge feed= 41.072 mm/min
Engage feed =15.402 mm/min
Cut Feed =173 mm/min
and Rapid is used as Transfer Feed

The Motor when enabled, Can't be rotated with the help of Hand Force by forcing the big Pully... I don't know How you can Pull the bus with it?

Also, I have found that when backlash is enabled in Mach3, I can't increase my IPM!!!..If I set velocity says 200 the speed i am getting like i am getting 40.. Increasing The Velocity value in Mach3 motor tunning do not affect the speed of the system:(

157

General Mach Discussion / Re: What Steps/ Units Settings for Z-axis (Quill) of CNC Retrofitted Radial Machine?

« on: May 22, 2010, 05:23:59 AM »

Hi Stirling Thanks.. and You are right about the Pinion movement figures.. Todays i checked by turning the Feed wheel...With One revolution (rough)  I am getting 120mm Rack movement it is almost 5inches.. and this is the reason I lost my Torque:(.. With 1200Oz-in Motor i am unable to drill a hole in Carbon steel.....

So installing Screw or worm-wheel will give me enough advantage to drill a hole in CS and SS material...
The same motors are installed on X/Y carriage and carries 220 lbs weight without loosing steps.. They are used in 1/2 steps mode with 5TPI lead screw and 3:1 reduction gears...

Regards

158

General Mach Discussion / Re: What Steps/ Units Settings for Z-axis (Quill) of CNC Retrofitted Radial Machine?

« on: May 21, 2010, 10:30:58 PM »

Hmm.. Excellent Hood:)... As far as I know, those gearings are for Automatic Feed and driven with Spindle Motor... If I enable it with Lever, i will no more use the Manual Feed.. It Means my Stepper will not work...However, nice idea and I didn't think on that earlier.. I will look into it and see how can i bring it to nearer to 1:1.. This will be great if i succeed...

159

General Mach Discussion / Re: What Steps/ Units Settings for Z-axis (Quill) of CNC Retrofitted Radial Machine?

« on: May 21, 2010, 11:43:02 AM »

Hi RICH,
hanks for helping hands:)...I somewhere studied the higher microstep means loosing accuracy...However, I am seriously thinking of, to remove the pinion and externally drive the QUILL with Ball screw... The second option is to add worm-wheel  gear box upto 100:1 ratio!!!!..

As far as Backlash, I saw this machine was used two times after it purchase for a very short run...
Best Regards

160

General Mach Discussion / Re: What Steps/ Units Settings for Z-axis (Quill) of CNC Retrofitted Radial Machine?

« on: May 21, 2010, 10:47:02 AM »

Hi Hood,
Thanks for helping me again;)... Both problems with the Z....a) 'Z' is not accurate b) The Motor runs very coarse... When I was calculating the Steps/Unit with The Dial Guage (10mm Range)..and I said the Z-axes Motor to go-down 7mm.. It goes down about 6.5mm with Jerks on the dial guage...

I have installed counterweight on the Quill and it is free to move with motor pully and i know i have no missed step..it moves like butter with 1200Oz-in Motors...

I want to run it fine and accurate.. I have tried many time to Move up and down but it goes up/down with sometime 0.5mm plus and sometime 0.6mm minus of actual moves...

I don't know whats wrong?