Messages

61

General Mach Discussion / Hot Stepper Motor

« on: June 29, 2008, 12:03:38 PM »

Hi All

I am currently adding a 4th axis to my mill (Wabeco 1210E)

The setup is now rotaing accurately but the motor runs hot

very quickly even with rotary table assembly removed.

Please find attached rough drawing showing

A) The motor details supplied by Arceuro

B) Details of how I have wired to G201 Geckodrive

Any help would be greatly appreciated

Cheers George

62

General Mach Discussion / Re: 4th axis setup

« on: June 23, 2008, 07:13:04 AM »

Hi Chris / Jim

Many thanks for your help guys

sorted out electrical fault (geckodrive terminal had bad connection)

All appears to be working well now but

Steep learning curve ahead.

Cheers George

63

General Mach Discussion / Re: 4th axis setup

« on: June 20, 2008, 06:20:38 AM »

Hi Chris / jim

Many thanks for the help.

I have altered the settings and the speed is working a treat, I have had to turn the vel / acc

down to a similar level to the other axis now. Result.

Now that it is moving easily I will have had a better chance to play.

(previously it was taking about 2 mins to move 10 deg)

I think the accuracy problem was my fault. I was trying it out using MDI

screen G01 A10 expecting it to rotate by 10 degs instead it moved to angle 10 deg

a relative / absolute mistake. what threw me was that the readings we so close.

Only problem now is I have noticed there is an intermittent electrical fault on one

of the wires which I will need to find. When doing a large rotation the movement

occasionally stops even though the dro says it is still moving.

Will try to sort this out and let you know what the final answer was.

Many thanks for your help

Cheers George

64

General Mach Discussion / 4th axis setup

« on: June 19, 2008, 03:11:14 PM »

Hi All

I am running a wabeco 1210 and I am currently trying to add a 4th axis.

I have used an Arceuro 4"" rotary table and stepper and connected up

using an oldham coupling arrangement.

Problems.

1) The stepper is moving very slowly compared to the other axis

2) I have a loss of accuracy. eg when I tell it to rotate 10 deg it will rotate approx 9.5 deg

(measured using the scale on the table)

I have gone through the full coupling and there is no signs of slippage or backlash

(when power is disconnected the movement turns easily)

My motor settings are as follows

                steps per            vel               acc                 g

x axis          1000               1500             192             0.019579

y axis          1000               1500             190.8           0.19464

z axis          1000               888               89.77           0.0091548

a axis          400                3592.8           689.06         0.070267

Kernal speed 25000

I have tried to up the vel/acc with only marginal improvement

My logic for the 400 steps per is as follows

rotary table ratio 1:72
system uses geckodrives G201 with 10 micro steps
motor step angle 1.8 deg =200 steps per rev

mach steps per rev = 200 x 10 microsteps = 2000

steps per = 2000 x 72 / 360 = 400


Can anyone help ?

Cheers George

65

General Mach Discussion / Re: Abnormality (Exact stop vs constant velocity)

« on: July 25, 2007, 06:54:29 AM »

Hi TP

As far a I am aware there is a spindle encoder fitted.

On the mach screen I can see programmed rpm

then underneath the slightly flucuating actual rpm.

Now do I use this to good effect?

Cheers George

66

General Mach Discussion / Re: Abnormality (Exact stop vs constant velocity)

« on: July 23, 2007, 03:44:23 PM »

Hi Brett

Rather than waiting to tomorrow I decided to recreate the programe.

(a dummy prog of 4 holes drilled then tapped)

Don't worry about the speeds and feeds for tapping i am just going off

memory. The original were worked out using the formulae in the

tapping brochure. The operator instructions for the unit says the

tapping head must not be run in ramp or exact stop mode and at the

moment it is.

Many thanks for looking

Cheers George

67

General Mach Discussion / Re: Abnormality (Exact stop vs constant velocity)

« on: July 23, 2007, 11:46:59 AM »

HI TP

Hopefully the SPD5 tapping manual is attached.

let me know what you think

Hi Brett

programe is at work so will post tomorrow

many thanks both for your help

Cheers George

68

General Mach Discussion / Re: Abnormality (Exact stop vs constant velocity)

« on: July 23, 2007, 05:59:31 AM »

Hi TP
As far as I can tell there is no clutch with this model.

Certainly not the type that has spring loaded torque settings

on the top. When I work out how to attach a file I will post

a copy of the manual

Cheers George

69

General Mach Discussion / Re: Near crash

« on: July 20, 2007, 05:27:06 AM »

Thanks jim ,
your rapid height explination makes sense now and thats a great tip about the search facility.
I am now older but wiser.
once again many thanks for your help
George

70

General Mach Discussion / Re: Near crash

« on: July 19, 2007, 11:24:24 AM »

Hip Hip Horray

Think i've cracked it. Yes it was pilot error.

Spent today trying to retrace my steps. Think what i've done is forgotten to enter any details into the cut parameters box as I do remember having to manually edit the cut depth line from 0 to -1.0 which means the rapid height box will also have been 0.

Only thing I can't get my head around is why did it rapid travel at Z-1.0 and not Z0.0. Any ideas anyone?

Also I did another dry run in mach. The simulation showed the rapid movement (dotted line) well above the work surface. However when I did a line by line run through is clearly shows it moving across at Z-1.0 level. when the programe ends all trace of the faulty cutter path disappears making you think all is well.

Does anyone know of an idiots guide for checking this? (programe verification software etc)

Cheers George