Re: Mill/Drill CNC Conversion

--- In CAD_CAM_EDM_DRO@y..., ptengin@a... wrote:

> Jeff,
>
> I only saw a couple of ?s. How are you attaching the pulleys to

the

> shafts? I have been successful with smaller pulleys setscrewed to

motor

> shafts but only with a touch of locktite. The larger pulley I would

go for a

> clamp or split taper lock like the Fenner stuff etc. The other one

is that

I milled a keyway in the shaft and "created" a keyway in the pulley,
so my plan is to key the two together. Regarding the pulley, the ID
was 1/2" while my shaft was only 3/8". I took a bronze bushing (1/2"
OD, 3/8" ID), milled a 1/8" slot along its length, and used Locktite
(620? - shaft locker) to secure it into the pulley. Instant keyway.
Once the pulley is keyed to the shaft, I'm using a nut to secure it
axially (hence my threaded shaft end.)

> you appear to be using non preloaded ballnuts. You will need to

keep the drag

> rather high on the gibs or the cutter will grab the part once in a

while.

I figure I'd start with non-preloaded nuts as they are significantly
less expensive than the preloaded ones ($20 vs. $160.) In my initial
test of my table I found no perceivable backlash, but that of course
will change once loads are applied. I guess I'll cross the backlash
bridge when I come to it.

> Backlash can be solved with software to a degree but the "grab"

part is

> tough. If you got these addressed already, forgive me since I did

not see it

> in the photo's. Otherwise, really nice. I still have not finished

my RF-45

> mill. Similar to yours...
>
> Peter
> THRD, Inc.
>
>
>
> In a message dated 1/10/2002 10:34:08 AM Hawaiian Standard Time,
> jswayze@o... writes:
>
>
> > If anyone has questions or sees errors, please let me know. I'm
> > hoping to have both axes operational by next week, and the

stepper

> > drivers and software ready by the week after.
> >
>
>
>
>
> [Non-text portions of this message have been removed]