Re: [CAD_CAM_EDM_DRO] Ultimate design spindle head

Greg,
I think you are on the right track. I mentioned in a post a while back about a friend who has done something similar. What he did was use a long hollow tube, and insert a new spindle thru the middle
and supported the shaft on each end with a qualified bearing. I think he uses a toothed belt to connect it to a typical variable speed router than hangs off the side on the top. It looks like an
electric screw drive actuator on his machine.

The reason he did it is that he machines a lot of molds out of foam and needed a vary small footprint around the tooling. So in his case, he made the shaft, the new spindle itself the Z axis ! A
brilliant idea really.

One of those super tuff, super thin step pulley and belt combinations would be compact, and a DC motor with Feedback or a high freq setup would be excellent. I guess I would opt to make it robust
enough to drill with. The right motor might allow low enough speeds.

The trick is, can it be made so it costs less than what is available now. On the build your own level it sounds great......

Chris L

Greg Jackson wrote:

> I am thinking about designing a totally new spindle head and drive. It
> seems to me that most inexpensive imports are much too heavy on the low end
> speed, with RPMs down to 100 or less, while very weak on the high end. I am
> leaning toward throwing away the low end in favor of high speed and
> simplicity. A 4 step pulley, in combination with a VFD could produce full
> power at 400 to 5500 RPM if the native pulley system were to produce 600 to
> 2500 in four steps off a 1725 motor. This puts tasks like deep 1" hole
> drilling off the machine and onto a drill press, but I figure that task
> belongs there anyway. Any opinions on this?
>
> G. Jackson
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