RE: [CAD_CAM_EDM_DRO] Re: HTD belts and pulleys: transmission

Salvador,

Certain Olham, bellows, and helical beam couplers can
work very well if properly selected for backlash and
wind-up torque.

Solid couplers have the advantage of economy. Some of
the other types can be quite expensive.

As I mentioned solid couplers require very accurate motor
mounting unless the motor is light enough to be cantelevered out
but constrained only radially.

This of course assumes that your motors have the proper torque
and speed for direct drive.

Les

Leslie M.Watts
L M Watts Furniture
Tiger Georgia USA
http://home.alltel.net/leswatts/wf.html
Engineering page:
http://home.alltel.net/leswatts/shop.html
CNC surplus for sale:
http://home.alltel.net/leswatts/forsale.html
CNC carved signs:
http://home.alltel.net/leswatts/signwp.html




-----Original Message-----
From: sattwaguna [mailto:plgrim@...]
Sent: Saturday, September 06, 2003 6:34 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: HTD belts and pulleys: transmission


Hello.

Thanks. I was also thinking yesterday in Oldham couplings. Seems to
me a interesting coupling solution. But belts&pulleys are very
interesting, for example, with couplings the stepper motor seems very
far from the machine, if you do not cut some of the axis. Not only
cosmetic factor, as the machine can suffer more.

Some experiences with Oldham or you consider that is not a good
solution in CNC coupling?

Regards,

Salvador.

> Engineering page:
> http://home.alltel.net/leswatts/shop.html
> CNC surplus for sale:
> http://home.alltel.net/leswatts/forsale.html
> CNC carved signs:
> http://home.alltel.net/leswatts/signwp.html
>
>
>
>
> -----Original Message-----
> From: Tim Goldstein [mailto:timg@k...]
> Sent: Friday, September 05, 2003 4:32 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: RE: [CAD_CAM_EDM_DRO] HTD belts and pulleys: transmission
>
>
> > -----Original Message-----
> > Hi Salvador
> >
> > If you decide to use timing belts I would suggest
> > Gates GT type. They have about the best registration accuracy.
>
> Remember, while it is true in the bigger, better, faster, more

power, my

> dad can whoop your dad ego building manner that us men approach

things,

> that the HD and GT series belts do have better specs in regards to
> registration accuracy, there have been a lot of machines built over

the

> years and still running that use the XL and L series belts. While

the

> tendency is to want to over build and over spec everything on a

machine

> the results will not be based on the best component you put in the
> system, but the worst. With all the possible places to have losses

of

> accuracy the difference between the older trapezoidal shape belts

and

> the newer rounded tooth belts are probably not the major factor in

most

> of our machines.
>
> Tim
> [Denver, CO]
> Beat the Sherline Oct 1 price increase. Order Now!
>
> Sherline & Taig products at Deep Discount
> Mach1 & DeskCNC with credit card ordering
> www.KTMarketing.com/Sherline
> e-mail me at Timg @ KTMarketing.com for items not yet listed
>
>
>
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