Re: [CAD_CAM_EDM_DRO] Dan Ms' Mill drill Re: GeckoDrives.. Servo motor

What is even worse that the backlash with these machines is that the acme
leadscrew pitch was off. I measured mine at being off short by .010 in ten
inches with the backlash taken up. The ballscrew removed the .02 backlash
and the pitch is perfect at .200 per thread over 10 inches.
I can't remember it has been so long but I don't recall the problem with the
gibb adjustment.
Dan
-----Original Message-----
From: Joel Jacobs <jj@...>
To: CAD_CAM_EDM_DRO@yahoogroups.com <CAD_CAM_EDM_DRO@yahoogroups.com>
Date: Friday, March 16, 2001 8:26 AM
Subject: Re: [CAD_CAM_EDM_DRO] Dan Ms' Mill drill Re: GeckoDrives.. Servo
motor

>Dan,
>Did you do anything with your gibb adjustments? On mine the slot in the
>gibb that the adjustment screw head rides in is wider than the screw head
>and the gibb moves back and forth a bit everytime the axis changes
>direction. Also there is no way to lock the adjustment down, so It wanders
>around on it's own. I'm thinking about fabricating a screw clamp on the
>opposite end of the gibb from the adjustment screw that would push the gibb
>toward the adj. screw - I think that would lock everything in place.
> I sure can see why this machine will benefit from ball screws. A couple
>months ago I had .014 backlash on my X axis. last night I was checking it
>out and the backlash is up to .017. The oil on the screw has a definite
>bronze color so I'm guessing the nut is wearing away.
>
>
>----- Original Message -----
>From: "Dan Mauch" <dmauch@...>
>To: <CAD_CAM_EDM_DRO@yahoogroups.com>
>Sent: Friday, March 16, 2001 10:37 AM
>Subject: Re: [CAD_CAM_EDM_DRO] Dan Ms' Mill drill Re: GeckoDrives.. Servo
>motor
>
>
>> I was using maxnc4 deluxe.
>> When I was preparing the x axis table for the ballscrew drive nut I
>noticed
>> that there was a tight spot on the X axis when the Gibb was adjusted to
>the
>> saddle and when the saddle was slid back and forth there was a noticeable
>> tight spot in one location. So I used some non embedding lapping compound
>to
>> remove the tight spot. After it was removed I placed the table on my
>milling
>> machine and indicated the surfaces. It was generally within .001" which
>> after seeing all the problem with poor pitch tolerances on the original
>> leadscrews that this was about as good as I was going to get.
>> Dan
>> -----Original Message-----
>> From: ballendo@... <ballendo@...>
>> To: CAD_CAM_EDM_DRO@yahoogroups.com <CAD_CAM_EDM_DRO@yahoogroups.com>
>> Date: Friday, March 16, 2001 5:10 AM
>> Subject: [CAD_CAM_EDM_DRO] Dan Ms' Mill drill Re: GeckoDrives.. Servo
>motor
>>
>>
>> >Dan,
>> >
>> >What controller software?
>> >
>> >Ballendo
>> >
>> >P.S. On the subject of the mill/drill, I believe I remember you
>> >saying you "lapped the ways" when you installed the ballscrews? How?
>> >Did you scrape it also? Thanks in advance. Also, did you use a LH
>> >ballscrew for Y axis, to preserve conventional handwheel direction?
>> >
>> >
>> >--- In CAD_CAM_EDM_DRO@y..., "Dan Mauch" <dmauch@s...> wrote:
>> >> The motors are rated at 420oz in. peak torque and 210 oz in
>> >continuously.
>> >> They are awesome on a mill drill with ballscrews. On my no name
>> >imported
>> >> mill/drill with ballscrews I get 180" IPM using those motors with a
>> >2/1
>> >> reduction. Dan
>> >>
>> >> -Dan
>> >
>> >
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>
>Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the

discussion of shop built systems, for CAD, CAM, EDM, and DRO.

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