Messages

81

General Mach Discussion / Re: Those pesky circles

« on: September 03, 2006, 06:52:40 AM »

I'm on Mach2 Brian, so no Sherline mode..

Jim

82

General Mach Discussion / Re: Those pesky circles

« on: September 02, 2006, 03:31:35 PM »

John S Thanks, thats a fantastic offer.
I'll have a go myself before I ask you to put on your snowsuit and head up into the hills. -The suggestions from the guys on the forum have given me loads of leads, so I'll follow them up as far as I can.

thanks again.

Jim

83

General Mach Discussion / Re: Those pesky circles

« on: September 02, 2006, 02:43:43 PM »

Sunny Buxton in Derbyshire Wayne.

Art and Hood have suggested ways of measuring the backlash, which I have yet to do.
Considering, like you say, the amount of backlash, I expected to be able to feel it in the machine, but rocking the thread from the end does seem to move the zaxis instantly. this leads me to want to investigate the stepper/thread interface. I seem to remembr reading years ago that things like a short length of tubing can be used to form a crude clutch in case of a crash, and I am wondering if there is something like this that has malfunctioned. Either this or there is some direction change timing problem like you say. Also there is the problem of apparently losing steps quite badly,...I'm starting to think mechanical rathr than electronic.

thanks for your help.

Where are you Wayne?

84

General Mach Discussion / Re: Those pesky circles

« on: September 02, 2006, 02:13:44 PM »

Thanks fdos, that discounts the accumulation of error pulses causing it, and leaves me with good old mechanical backlash on the x axis, and it doen't matter what the drives are.

Photo attached of screws at base of z axis

Cheers

85

General Mach Discussion / Re: Those pesky circles

« on: September 02, 2006, 01:32:17 PM »

Ooop that was to big for my screen

86

General Mach Discussion / Re: Those pesky circles

« on: September 02, 2006, 01:27:56 PM »

Hello guys.
Some answers here.. 8 wires to the round Servo/stepper, wired in 4 pairs I notice.

Some pics attached

87

General Mach Discussion / Re: Those pesky circles

« on: September 01, 2006, 05:54:07 PM »

It's great to have you guys on my case. They're definitely round, but I'll have to count the cables in the morning.

'night all.

Jim

88

General Mach Discussion / Re: Those pesky circles

« on: September 01, 2006, 03:18:35 PM »

It's a home built beauty, not by me, by two others, one who made the structure, and put some controls on, and one who took the wiring out again and reworked it. I'll post some pics tomorrow if I can, and see what you think.
The guy I got it off said this forum was great, and very helpful, and he was right.

Thanks guys..
Jim

89

General Mach Discussion / Re: Those pesky circles

« on: September 01, 2006, 11:46:43 AM »

Your're right Darek, thanks for the work.
Servo machine? I'm not sure, is this the type of motor Darek, how could I tell?

Jim

90

General Mach Discussion / Re: Those pesky circles

« on: September 01, 2006, 08:08:25 AM »

Thanks for input guys. I'll get back to you asap with answers.

Jim