Re: [CAD_CAM_EDM_DRO] Maximat conversion

In a message dated 03/08/2001 8:52:31 PM Hawaiian Standard Time,
gordonr@... writes:

> Yes, thanks. I'd love to see the photos....especially of your bracket for
> the screw mount. You can email them to me at Smoke@... ... post
> them too...I'm sure others would like to see them.
> I assume (I haven't taken the column apart) the disk you mentioned replacing
> is mounted somehow on top of the column?
>
>
> I've got the brackets designed for using type 34 stepper motors. The
> catalog I have lists holding torques of 156, 312 and 469 oz in. I presume
> (this is all still Swahilli to me) these are the motor ratings to look at
> when choosing a motor size?
>
>
>
>

Smoke,

I tried to post today but have forgotten my Yahoo password etc. I will make
an effort to get in tomorrow. Seems it was easier to do back when it was
E-groups. Yes, the stock disk is about 4 or 5 mm thick. I replaced it with a
3/8" thick pc of steel. It is retained by a (stock) massive snap ring.

For the auto luber, I machined a ring that clamped around the column. It
has a break in it to jump over the keyway. Inside, it has a groove machined
almost all the way around. Into this, I stuffed a felt strip. From the groove
to the bottom, there are tiny grooves filed with a triangular file. I had a
Trico metering unit installed to supply the oil. Kept a nice film of lube on
the round column.

With this constant flow of lube, I was able to get my initial smaller motor
to move the head fairly good. The moment I lost lube, I galled the column
since I ran it so tight. The 350 inch motor would do OK if you got a 2 or 3
to 1 reduction, the larger ones would give a tad more speed. I thought the
column was cast iron but it is actually a steel tube and subject to galling.
Turns out, it was hour glass shaped. It was not worn at all as the original
grinding marks were still fresh. However, the tube was about .0015 to .003
smaller in diameter in the middle than at the top and bottom. No wonder I had
so much trouble adjusting the slider. Hopefully yours was made to better
tolerances.

Peter
THRD, Inc.



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