Re: [CAD_CAM_EDM_DRO] Re: Best source for Servo's ?? speeds and plasma

Hi Dave,

I am using 15mm 8mm pitch HTD belts on my mill. HTD is better than the
'classical' trapezoidal tooth profile. It is smoother running, has
better repeatability and can transmit more torque. Here in the UK it is
significantly cheaper especially in the wider sizes. If I remember
correctly the 3 metre, 30mm wide belt on my plasma cost something like
30 UK pounds.

0.24 inch/turn sounds much too small to me. That gives you a resolution
of .0003"/step. For plasma I would have thought somewhere around 3 - 5x
that would be more suitable. At 0.24in/turn the rotor inertia will have
a significant effect on the acceleration.

The motor shafts are 17mm on teh drive end and somthing like 6 or 7mm on
the other end.

Les

turbulatordude wrote:

>
>
> This brings into question the use of high speeds and plasma
> machines. As I understand, plasma cutters on thin stock should
> operate at higher speeds.
>
> I am getting ready to order a similar motor in this thread, but from
> Surplus Center
> http://www.surpluscenter.com/item.asp?
> UID=2005010323083678&catname=&qty=1&item=10-1783
>
> Items 10-1783 and 10-1573 are the motors
> and item 10-1834 is a small motor with a 200 encoder.
> lose the motor and use the encoder.
>
> I am looking at the gear reduction.
>
> It seems that XL belts might be too small, but I have not tested that
> as yet.
>
> I found a 24:60 primary ratio and a 24:60 secondary ratio into a gear
> rack of 12 pitch and a 16 tooth drive gear offer 0.24 inchs per
> revolution of motor.
>
> What I have not figured is the shaft thicknesses. I hate to think it
> would depend on a 1/4 shaft for the gear or some sillyness.
>
> Here is a picture that Graham sent me (thanks Graham) of a similar
> drive train. That wide drive belt seems to be hard to find and darn
> expensive !
>
> http://www.axxustech.com/Axxus4x8/Axxus%204x8%20motors.jpg
>
> Dave
>
>
>