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Messages - james elder

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1
General Mach Discussion / Re: On the fly z axis adjustment?
« on: March 16, 2015, 02:27:02 PM »
Ressurection of a thread, I know, but I have followed the instructions from Hood, thanks, but I seem to be getting only a one-hit, ie a z- or a z+, then no other movement, (this may be the correct action for THC, I don't know) and it doesn't seem to be related depthwise to the settings on the plasma screen, where the minus is .01, but I am getting about 1mm. Any ideas?
Jim

2
Hi Guys, greatful for the follow up suggestions.
An update. I contacted a local guy who saw my cnc machine years ago and went away and built himself one, then another, and another, to see if he had any bits, because even if it is my gecko, I would have had to wait two days to get a new one, and then, who knows? and I have the customer waiting,,, Unbelievably the guy lent me his machine. Its in the workshop now wizzing away. My priority is getting the job done before I try repairing mine.
At which point I will swap the Geckos, which is ok this time because the fault isn't a gecko fatal one. In other words, if the Gecko blows, don't put another one on :-[ If the motor stutters, swap the geckos and track the fault.
jim

3
No, juddering and stuttering, not turning. I will swap the drives shortly.

4
Blow a drive and you are forgiven. Blow another drive and you deserve to pay the price! Wink

RICH

 How prophetic, that was you to me last september Rich.
Searching the forum it's the Gecko isn't it.
I'll swap them in the am and see if the fault migrates, since it isn't a Deadly fault

5
There's only continuity in the phases, and none where there shouldn't be, and 3 phases settle at 1.3 Ohms one at 1.2.
Now I have taken the belts off, I can see the spindle is stuttering, doing maybe 1/4 turn, sticking, vibrating etc.
Does this point to any suspects?
Oh, the gecko tests ok, and remade all the contacts on it with new blocks.
Jim

6
and the stepper is singing quietly when it is idle. very high whistle.

7
Ok.
Z movement, hurray, with new gecko, the old one was foolishly sacrificed
X movement, hurray, new gecko, and new motor.
Y noise but  no movement. a sweet whine, responds to the keys. This has had no parts but did bind at the end of the last session, when it made a noise like a toothed belt slipping, which is what it drives.
What could hve affected this axis, or what does the noise suggest?
Thanks for replys
Jim

8
As with other things, one disturbance telegraphs down through through time magnifying as it goes. This all started with a Kress safety feature. When the brushes are halfway worn, there is a spring inside that pops out and that,s it. Stopped dead. 10mm in the wood. it saves the kress armature!
Jim

9
Hi HeadSmess,
I can't afford these Gecko's, hence the anxiety I mention. Well, not as a method of testing the motor anyway!
A new motor is in my posession, smaller and lighter than the original, as Rich suggested. This opens up possibilities for when there isnt' a rush on; I could swap the big one from the Z for this lighter one. There isn't much triangulation on the Z, and the weight of the motor at the top makes it pendulum a bit.
I was fooled last time when I eventually found some hidden fuses. this time I saw half a cup of grey smoke and heard two cracks. The first I didn't see, but I heard it, and, I am testing right at the motor. 8 wires 100mm long, straight in. Two phases are connected that shouldn't be. 201's
Right at the stepper Fastest1. There isn't much hope for it I'm afraid. The replacement cost less than the Gecko so...
Thanks for the replys guys. There's something heartening about communications from other members.
Jim

10
Thanks, Rich, I think I'll print this out and staple it to myself.
I have taken advice from cnc4u, who have a motor just for the job of replacing these, and on is on it's way. There's also two gecko's and a rabbits foot on its way, but i confess to some anxiety. Thanks for the help.
jim

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