Re: Spindle motor drive belts MAXNC 10 UPDATE

BTW Maxnc says their system has .000125 resolution. I know this isn't true
becuase they must have a lot of backlash in the leadscrews. How much
backlash does your machine have?
Dan
-----Original Message-----
From: hansw <hansw@...>
To: CAD_CAM_EDM_DRO@onelist.com <CAD_CAM_EDM_DRO@onelist.com>
Date: Thursday, November 04, 1999 6:43 PM
Subject: Re: [CAD_CAM_EDM_DRO] Spindle motor drive belts MAXNC 10 UPDATE

>From: hansw <hansw@...>
>
>Jon,
>Thanks for the detailed reply. I looked at your picture, it looks a lot
>sturdier than the crap MAXNC puts out.
>The guy had the nerve to tell me " we designed it to be flexible" ...I
>also notice the carcass of the MAXNC electronics hanging on the back of
>the mill.... I purchased a complete MAXNC -10 because I needed a mill, I
>did not want to build one....
>What kind of electronics are you using to drive the motors ?
>
>Well I'm in the middle of making a new motor mount. it will be a four
>point mount and will allow full adjustment... I'll post the results at
>my web site when I done...
>
>Sure it's a deal, and now that I've re-built over half of it, I regret
>not doing it from the beginning, the regrets are about $500.- worth of
>motors and electronics and software.. I ordered 70oz-in motors and
>realized after a while that they could not be that powerful. My tests, (
>see my web site how I do it ) tested the so called 70oz-in motors at
>42oz-in..... When I asked to see the manufacturers data sheet on the
>motor I was told it was not available and I could get a refund... I'll
>keep the motors as a reminder that I should not be so dumb fat and happy
>with everything that's fed to me in brochures... I'm not flaming anyone.
>I'm just stating the plain honest facts...
>
>Would I buy a MAXNC again.... Well no... I do learn from my mistakes...
>would I recommend it to anyone... Well NO...
>
>Jon, I appreciate the help and all the feed back, hope I can repay some
>day...
>
>regards
>Hans Wedemeyer
>
>
>Jon Anderson wrote:
>
>> Hans,
>>
>> First mod I made to my MAX was to toss the spindle motor into the
>> spare
>> parts bin. I fitted a Sherline DC motor and control. It's a tight fit
>> betwen the Z stepper motor and the spindle.
>> Here's a link to a pic of mine
>>
>> http://www.prototype-design.com/images/Shermax1.jpg
>>
>> You can see here the adapter I made to use a Sherline spindle as well.
>> If you (or anyone else) is interested in this adapter, I can post the
>> 3D
>> wireframe in DXF format.
>> You can see that I'm only using one bolt on the end plate on each
>> stand
>> off, and have no problems with vibration or flex. I think part of your
>> problem is the standoff isn't seating well against the sheetmetal
>> case.
>> MAXNC is getting better at spin control. I seriously doubt that flex
>> was
>> engineered! The whole thing is cost driven more than anything, and
>> it's
>> a decent bargin alright, but some mods will go a long way towards
>> making
>> it more useful.
>>
>> BTW, you can see in place of the stock motors, I've made thrust
>> plates.
>> There is a custom stub shaft passing through dual ball bearings.
>> With a nylock nut for adjustment, I can dial out backlash and relieve
>> the motor of thrust loads. Note, this does nothing for backlash at the
>> leadscrew nut... The Sherline spindle adapter has a constant force
>> spring inside that is attached to the thrust plate. I forget, but
>> think
>> it's rated for 7 lbs, and it releives the Z motor of some of it's
>> load.
>> Can also post a DXF file of the thrust plates and the stub shaft.
>>
>> As for your setup, I would suspect that either the V groove angle is
>> not
>> right on one or both pulleys, or possibly one of the pulleys V-grooves
>> isn't concentric to the bore. Does the belt vibrate or flutter a lot?
>>
>> Jon
>>
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>>Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the

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