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Author Topic: problems with machining holes and Z axis  (Read 3515 times)

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Re: problems with machining holes and Z axis
« Reply #10 on: October 09, 2017, 02:10:12 PM »
Hi,
I still think you are gaining or losing steps and not just restricted to the Z axis.

The acceleration setting in motor tuning is very important, if its set too high it will loose steps. One recommendation is to set it
at no more than 10% of the velocity setting. The general principle is start slow, very slow and then increase the settings until it
starts misbehaving and then back off a bit.

Craig
My wife left with my best friend...
     and I miss him!
Re: problems with machining holes and Z axis
« Reply #11 on: October 09, 2017, 02:30:04 PM »
i feel i'm getting somewhere with it  :D

i have velocity set to 1999.8 and acceleratrion at 300. do you have a suggestion what to change each one too?

looking at the work piece, the off centring is caused by the x and y moving slightly between each plunge.

the south of the piece is flat and the north side stepped like the pyramids, which would make sense as the south steps would be cleaned off with each plunge.

Yes, yes Mrs Lincoln,...but apart from that, did you enjoy the play?
Re: problems with machining holes and Z axis
« Reply #12 on: October 09, 2017, 03:32:36 PM »
Hi,
try velocity a lot lower then work up.

Craig
My wife left with my best friend...
     and I miss him!
Re: problems with machining holes and Z axis
« Reply #13 on: October 09, 2017, 04:37:36 PM »
Hi,
what controller/BoB are you using?. Just wondering if its configured for pull-up resistors where your drivers
might be active low. A conflict of that nature doesn't break it as a rule but can leave it very susceptible
to noise, ergo gaining steps.

Craig

My wife left with my best friend...
     and I miss him!
Re: problems with machining holes and Z axis
« Reply #14 on: October 09, 2017, 04:55:36 PM »
Sorry Craig. I don't know the answer to that.
282545167242 eBay number for my exact machine.

I desperately want to upgrade the crap dremel type head for a spindle motor. But it does for learning at the moment.
Yes, yes Mrs Lincoln,...but apart from that, did you enjoy the play?
Re: problems with machining holes and Z axis
« Reply #15 on: October 10, 2017, 04:53:11 AM »
Hi,
unfortunately that number doesn't translate into a usable link.

Craig
My wife left with my best friend...
     and I miss him!
Yes, yes Mrs Lincoln,...but apart from that, did you enjoy the play?
Re: problems with machining holes and Z axis
« Reply #17 on: October 10, 2017, 05:11:49 AM »
Try that one.
Yes, yes Mrs Lincoln,...but apart from that, did you enjoy the play?
Re: problems with machining holes and Z axis
« Reply #18 on: October 10, 2017, 05:16:19 AM »
Hi,
yep got that. Definitely parallel port input. Do you feel inclined to take the top off to get some close ups of the BoB and drivers?

Craig
My wife left with my best friend...
     and I miss him!

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Re: problems with machining holes and Z axis
« Reply #19 on: October 10, 2017, 05:17:30 AM »
Hi zxrjohn14,

Which version of Mach3 are you using ??

Tweakie.
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