Re: Spindle motor drive belts MAXNC 10 UPDATE

Darrell,
I understand, and it was in this context that I mentioned repeatability.
After all what's the point of claiming a fantastic resolution is, if you
can't put the darn cutter where it's supposed to go... No one has
mentioned linearity either... I have my doubts ( an stand corrected if
I'm wrong) that the cheap lead screw thread is absolutely as linear and
accurate as the resolution would dictate it should be... What do you
think?
Thanks for pointing this out..
regards
Hans Wedemeyer


Darrell Gehlsen wrote:

> Just a note.
> Resolution and repeatability are two very different things.
> Resolution is the distance the machine is supposed to move for each
> step.
> Repeatability is how close it comes to commanded position.
> Darrell
>
> ----- Original Message -----
> From: Dan Mauch <dmauch@...>
> To: <CAD_CAM_EDM_DRO@onelist.com>
> Sent: Friday, November 05, 1999 6:48 AM
> Subject: Re: [CAD_CAM_EDM_DRO] Spindle motor drive belts MAXNC 10
> UPDATE
>
>
> > From: "Dan Mauch" <dmauch@...>
> >
> > 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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