can you send me the photo?
----- Original Message -----
From: Okla Mike (Liltwisted)
To: legacy-ornamental-mills@googlegroups.com
Sent: Sunday, September 04, 2011 5:17 PM
Subject: Re: Build log of sorts for a 1200 upgrade to CNC
I show the picture inline, not as an attachment worked fine on Thunderbird
On 9/4/2011 6:35 PM, Tim Krause wrote:
Picture does not show up. See if you can send it to my personal email. I
wish I knew what you where doing that it's not working. I see the image is
converted to a mime attachment inline with the email rather than an attachment
to the email (separate file). I'm looking forward to hearing the results.
The added torque should be more than enough, the only real question is what
the top rpm range you will get out of it. I'm thinking it might stall out near
200 rpms but that's more than fast enough for legacy work.
Thanks for keeping us posted.
-Tim
----- Original Message -----
From: Dustin Yoder
To: legacy-ornamental-mills@googlegroups.com
Sent: Sunday, September 04, 2011 3:57 PM
Subject: RE: Build log of sorts for a 1200 upgrade to CNC
Last time I left off, my A-axis didn't have enough holding torque. I
tried to research a bigger stepper, but nothing substantially better in the
600-900oz range really fit at 3.5A for my G540 controller, and I didn't want to
get into big bucks with another stepper, controller and parallel port, etc.
Nema 24 motors claimed better torque, but the price was too high--same with
bolt on gear reducers.
I decided to try a gear reduction as the lowest cost option that I could
reuse on the other axes if it didn't work.. I ended up putting around $70 into
it, which is around my limit that I wanted to spend right now. I'm going to
attach a photo, so let me know if you do not see it.
I used the existing holes in my headstock (one 3/8" hole and the 3/8"
hole for the spring point for the indexing gears). I built a 6:1 gear reduction
and pretty much eyeballed all the drill holes to get a reasonable result. All
shafts on the gears are 1/4" D-shaped shafts that I got from mcmaster. The only
modification that I made was to tap a 10-24 hole in the headstock to clamp the
1/4" shaft inserted into it(note the bolt sticking out of the top of the
headstock.) I didn't feel like this was making an irreversible modification, so
it fit within my guidelines.
Originally, I wanted to turn down a 5/16" bolt to 1/4" on the end so that
I could just screw it into the headstock without having to tap a hole, but my
turning skills suck and I have no clue how to run my little metal lathe.
I pressed oilite bearings into the aluminum frame for the 1/4" shaft. I
figured they'd add a little durability.
In all, this is a very garage shop/jury rigged setup, but it is
functional. I'm going to test it out under load hopefully this week.
Dustin
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