Messages

1

General Mach Discussion / Re: Need help with Bridgeport Series One CNC Retro Fit

« on: November 08, 2010, 11:35:50 PM »

BR549,
I don't know what happend to the rest of my last post but here is is again. Steppers are wired parallel the voltage reads 58.6 VDC at idle and around 58.3 or so at 70 IPM. Just for thought, Bridgeport set the steppers on BOSS 5 at 1/2 step pulse which ment that each pulse was .0005 of movement. This may be part of the reason that big NEMA 42 don't like micro steeping. (10000 pulse per inch is a lot of pulses)  I have emailed GECKO for some ansers.

Thanks
Coke

2

General Mach Discussion / Re: Need help with Bridgeport Series One CNC Retro Fit

« on: November 08, 2010, 03:44:52 PM »

BR549,

3

General Mach Discussion / Re: Need help with Bridgeport Series One CNC Retro Fit

« on: November 06, 2010, 10:27:44 PM »

Thanks Ray for the input. I have 33000uF and the problem is still there. I have emailed Gecko for more advice on these NEMA 42 steppers.

Coke

4

General Mach Discussion / Re: Need help with Bridgeport Series One CNC Retro Fit

« on: November 06, 2010, 05:59:11 PM »

Terry,
I don't think it loses any steps at high speed. It runs very smooth in motor tuning. I will set the speed up on the program and try that later tonight.
Thanks Coke

5

General Mach Discussion / Re: Need help with Bridgeport Series One CNC Retro Fit

« on: November 06, 2010, 05:31:33 PM »

Terry, Hood    What I have is 1970 Bridgeport Series 1 Cnc updated to BOSS 5
                     I installed a AN TEK 800VA Toroidal Transformer 10 Amp and built the rest of the power supply from parts
                     The original steppers are Superior steppers (90 VDC 8Amps)
                     I replaced one with a Kelling KL42H2150-42-8B 
                     All 3 drives are Gecko 201 they are set microstepping the way I read the set up sheet
                     Sound Logic BOB Rev 1.9 (Bob Campbell has been a grate help)
                     Added a Sumitomo VFD and a sound Logic inter face board
                     Current motor setup
                     Steps Per            Velocity                Acceleration           Step Pulse               Dir Pulse
                        10000                70.0                       2                         5                          5


I run a progran to make a 6" square with a 1.5 pause at each corner as to read indicator before next axis move, it misses steps at all speeds worst at 31 IPM.                 

Coke

6

General Mach Discussion / Re: Need help with Bridgeport Series One CNC Retro Fit

« on: November 05, 2010, 12:17:47 AM »

Power supply size and voltage: 60 volt DC; Drives: Gecko 201; AMP settings 6 amps; Stepper make and model: Z and Y axis are original NEMA 42, X axis has a new Kelling NEMA 40 tooth; Tuning: Currently 55 VEL acceleration is set a 1.75; Drives are belt 1 to 1 5 tpi lead; Drive test: with the tune feature in Mach and the settings for X and Z is 105 acceleration of 5 and the Y will only do 102 ipm with the same settings. I realize that is Mach running flat out but the motors all run smooth and quiet, the problem comes in when I slow down to run a program at slower speeds.
Thanks for your rapid response and willingness to help.

7

General Mach Discussion / Need help with Bridgeport Series One CNC Retro Fit

« on: November 04, 2010, 11:49:00 PM »

I started the conversion from original set up to Mach 3 with Gecko drives in October 2009.  Fast run down of changes: break out board from Bob Campbell, Windows XP Pro, stripped out old and replaced with new power supply and rewired everything, and a new computer.
Problem: X and Y axis has intermittent bumping and losing steps randomly. I have read a lot of the posts concerning lost steps and have tried many of the solutions offered with no luck. Motor tuning will run without any problems as high as 102 IPM but I can not get the mill to perform without losing steps as far down as 2 IPM which is unacceptable for a rapid rate or a G0 function. I have spent hours reading posts of other Bridgeport posts that only get 50-60 IPM on rapids which would be fine with me if I could get that without missing steps.
Any and all suggestions would be most welcome as I am at my wits end. Trying to keep post short but rebuilt  ball screws, replaced steppers (NEMA 42) and drive. There is a lot more I have tried, if you need more information on what else was done in order to help me please let me know.  Basically just about everything has been replaced with new.

Thanks in advance
Coke 

8

One on one phone support. / Bridgeport Series 1 CNC Needs Help

« on: November 02, 2010, 11:41:40 PM »

I started the conversion from original set up to Mach 3 with Gecko drives in October 2009.  Fast run down of changes: break out board from Bob Campbell, Windows XP Pro, stripped out old and replaced with new power supply and rewired everything, and a new computer.
Problem: X and Y axis has intermittent bumping and losing steps randomly. I have read a lot of the posts concerning lost steps and have tried many of the solutions offered with no luck. Motor tuning will run without any problems as high as 102 IPM but I can not get the mill to perform without losing steps as far down as 2 IPM which is unacceptable for a rapid rate or a G0 function. I have spent hours reading posts of other Bridgeport posts that only get 50-60 IPM on rapids which would be fine with me if I could get that without missing steps.
Any and all suggestions would be most welcome as I am at my wits end. Trying to keep post short but rebuilt ball screws, replaced steppers (NEMA 42) and drive. There is a lot more I have tried, if you need more information on what else was done in order to help me please let me know.  Basically just about everything has been replaced with new.

Thanks in advance
Coke