Re: RF-45 Mini Bed Mill

Well, the one that I ordered is coming with a single phase motor. That's
nothing that can't be changed though, since I have a pile of motors laying
around in the shop.

I planned on putting in the 5/8" ballscrews on the table, since I had read
somewhere that it was really tough to install the 3/4". It seems like the
guy who started Ah-ha (Doug?) wrote one time that he had to grind the hell
out of the underside of his table with a side grinder to give the nut
clearance (for X travel).

Thanks for the info on the VFD.


Dan





At 11:16 PM 8/30/1999 , you wrote:

>From: PTENGIN@...
>
>In a message dated 08/30/1999 5:21:05 PM Hawaiian Standard Time,
>dfalck@... writes:
>
><< 5. Installing a big (1 HP) Baldor PM DC motor to run the spindle, so that
> I can control speed and orientation (for future tool changer) with the

PC. >>

>
>Dan,
> Can you order the thing with a three phase motor? I didn't ask when I
>ordered mine. If you can, a VFD may be an easier way to interface to the CNC
>Controller. Many VFDs have the same +- 10 volt input as a servo. This allows
>the CNC to walk the spindle into correct orientation with the use of an
>encoder. Looks like they are using some kind of face mounted motor but I
>can't tell if it is a 56 C type or not. I don't know what the torque curves
>of your DC motor is but I know in VFDs, they often spec a motor twice as
>large in Hp as a single speed setup to get adequate grunt when running at

low

>RPMs. I may end up installing a Precise 60,000 spindle on mine. Otherwise, I
>should have thought of the three phase motor too! I was gonna go with

.750 X

>.200 screws. What size are you going with?
>Peter
>
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