Re: Re: Good source for MaxNC-10 Belts anyone

Ballendo,
yes a very good comment, and i also agree that the mounting of the
spindle motor, can be improved.
That i did as when my spindle motor burnt out, and could not find a
replacement here in south east Asia. So used a angle grinder motor, and
fitted it with a speed controller, now can go from 200 to 5500 rpm,
without belt changes, looked after the weak / flexing mounting when i
upgraded.

Re the surface finish, normally its on HDPE and PP that i work and get
good finish. Normally run a stepover of 0.5 mm with a 6mm ballnose, as
my parts are used as former for dipping latex balloons.What i have
noticed is that when roughing the tool seems to stay cooler (dry
machining), so maybe the "bounce" on the o-ring is actually helping in
some way. I seldom do any metal machining with this system, so unable to
comment .

John



Date: Thu, 15 Feb 2001 10:10:12 -0000
From: ballendo@...
Subject: Re: Good source for MaxNC-10 Belts anyone

John, Tracy,

I could be totally off base about this, but here's my thoughts...

You may be spending more in tooling than you're saving in belts! I'm
assuming that there is no deterioration of surface finish since you
didn't mention any, but have you checked/ compared?

The rubber of a typical o ring will "bounce" each time the cutting
edge hits the work. Maybe only a little, and maybe you're not
noticing, but I'd bet the parts and the cutters ARE!

If it's working for you, great! But tools and parts are worth more
than belts, and this could be sneaky to determine...

Hope this helps.

Ballendo

P.S. The motor mount of the MaxNC is a weak point, IMO. I think you
will be better served to improve the setup so that a PROPER belt will
have a useful life. /<flame suit on>

--- In CAD_CAM_EDM_DRO@y..., tnorris@h... wrote:
> Thanks John!
>
> O-rings are plentiful and easy to obtain. Even if they wear
twice
> as quick as the regular belts they are still cheaper to replace
> <grin>. (just hope they don't break in the middle of a job). What
> kind of belt life are you getting from the O-rings?
>
> Thanks again,
> Tracy
>
> --- In CAD_CAM_EDM_DRO@y..., John <machatak@t...> wrote:
> > List,
> > I also had this problem of wearing out Max-NC spindle belts too
> quickly,
> > and now use a simple O-ring about 3 mm in diameter.
> > Tensioning is a little of a suck and see issue, too tight will
put a<snip>