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Messages - RICH

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441
General Mach Discussion / Re: Motion controllers - Take me to school
« on: September 07, 2017, 10:32:48 PM »
Hey guys,

The "threaded" lead screws are 1/4-20.........

Check out  how expensive good small accurate ball screws are!

So I echo #5 from my post:
Is the current machine ( basic and all components) acceptable to do 1. to 4. above as is, with with steppers, with servos?

But #5 is useless without defining the first four steps. ;)

RICH  

442
General Mach Discussion / Re: Motion controllers - Take me to school
« on: September 07, 2017, 06:51:53 AM »
Quote
I get it. You hate the idea of servos put on a small machine where steppers would work just fine

Not realy....do / buy whatever you want.
Our thinking is different.
Your learning and many replies are servo  / stepper application.
So continue learning and take into consideration posted replies.

I would suggest that you just take a moment and define what you want out of the Sherline.

1. Max axis velocity for rapids
2. Max feed rate which will be required to accomplish the machining for whatever tooling and
    material you will use.
3. Required acceleration
4. Accuracy and repeatability of the axes.
5. Then review the machine and answer this question:
     Is the current machine ( basic and all components) acceptable to do 1. to 4. above as is, with
      with steppers, with servos?

Have fun in school,

RICH

443
Show"N"Tell ( What you have made with your CNC machine.) / Re: Trees.
« on: September 06, 2017, 05:08:30 AM »
Nice work as always Tweakie and surely beats doing it by hand with an iron.

RICH

444
General Mach Discussion / Re: Motion controllers - Take me to school
« on: September 05, 2017, 06:58:27 AM »
Quote
If speed, quietness and step accuracy are important factors to me, then the value relates to what is important to the end user. No?  

It's your money so do as you wish with it,BUT, when asking for advice realy consider what is being said.

Step Accuracy - testing we did with steppers counting steps / pulses ( ie;simutaneous recording  of 6 inputs for comaprison with a measurement accuracy of 29 ppm ) showed that actual steps / pulses  sent at various points along the system could for all practical purposes be spot on through the system if the system is capable of it.

Heck my engraving machines smallest actual move is 0.000040 but is limited to 7 ipm!

Yes step accuracy is important as it relates to theoretical resolution but actual accuracy
of the system comes from the mechanical components.

In 2.5 / 3d machining acceleration is very important (more so than velocity) and even if the actual material removal is small, fast  acceleration  ( which requires torque ) provides for reliable movement of small axis moves.

Hmm......, spend your money so you feel good, let us know how all goes!  ;D

RICH

445
General Mach Discussion / Re: Probing for XYZ in Mach on a mill help
« on: September 03, 2017, 12:20:09 AM »
So the fancy probe was tried on the lathe mounted on an attachment and let it probe a fancy handle.
So put it in a box for safe keeping. ;)

Using  the led probe ( $20) I could quickly just find points that I wanted so the fancy handle could be drawn.
BTW, slightly modified the probe end so custom probes could easily be made.
After probing, just click a button on the screen and a dxf drawing is created. Have choice of dxf with points or lines, I prefer points to quickly draw the fancy handle. Then dump dxf into LT, or whatever, and the gcode to cut it is made. Easy and quick .......... usually ::)

RICH

446
General Mach Discussion / Re: Probing for XYZ in Mach on a mill help
« on: September 02, 2017, 11:48:46 PM »
Joe,
Have a similar fancy one that sits in a drawer. 

Attached is one of the home made probes which  I use.
In use it's more accurate than the expensive fancy one I bought a long time ago that just sits in the drawer.
The probe tips are easily made or replaced. The bent probe tip is the result of operator error........! :D
Cost of new tip was approx a penny.  ;)

RICH

447
General Mach Discussion / Re: 2 Axis Dispaly w Encoders
« on: September 02, 2017, 08:43:30 AM »
Bob,

Let use know how things go as I may be interested.

RICH

448
General Mach Discussion / Re: Probing for XYZ in Mach on a mill help
« on: September 02, 2017, 07:10:58 AM »
Echo Tweakie's  first reply.
Quick and dirty insulator could be some swrink wrap or even electrical tape.

BUT

Make one that has approx. zero run out. Then  check the run out at the end of the probe when held in the chuck or whatever.
Your probed locations will only be as accurate as the mills axis can move and the how the probe is mounted.
Maybe I am a little goofy about accuracy, my lathe probing  is +- 0.0002" repeatable and accurate, but can't duplicate that
on my mill.

BTW, To check probing accuracy just probe a know standard. You will quickly know what I said above.

FWIW,

RICH


 

449
General Mach Discussion / Re: lazycam height
« on: September 01, 2017, 05:56:25 AM »
Tutorial #6 in the manual is about plunge clearance, etc.

RICH

450
Quote
If I wrote a macro to do a custom threading routine

Good luck.........

RICH

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