Re: Spindle motor drive belts MAXNC 10 UPDATE

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
>
> ------------------------------------------------------------------------
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
> discussion of shop built systems in the above catagories.
> To Unsubscribe, read archives, change to or from digest.
> Go to: http://www.onelist.com/isregistered.cgi
> Log on, and you will go to Member Center, and you can make changes
> there.
> For the FAQ, go to http://www.ktmarketing.com/faq.html
> bill,
> List Manager
>
> ----------------------------------------------------------------
> [Image]
> Click Here
>