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The Offcial Machinist Thread: Revised 01/04/2014

A place to ask general spud cannon related questions.
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Unread postAuthor: ramses » Tue Apr 10, 2012 8:01 pm

Get a clamp type knurler rather than a bump type. I've heard small lathes don't have the rigidity or power to use the bump type.
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Unread postAuthor: jackssmirkingrevenge » Tue Apr 10, 2012 11:55 pm

This is the Sherline offering:

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Haven't seen much good said about it though, and even their own instructions make it sound more like some kind of black art to set it up.

I did find this home brewed version, hmmm...
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Unread postAuthor: Crna Legija » Wed Apr 11, 2012 1:07 am

I just did knurling yesterday at trade school. The first bit of the crosshatch one be was really crap even the teacher didn't know what was with it.
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Unread postAuthor: jrrdw » Wed Apr 11, 2012 6:29 am

Crna Legija wrote:I just did knurling yesterday at trade school. The first bit of the crosshatch one be was really crap even the teacher didn't know what was with it.


Are you making something or is this just a practice piece?

There can be a few reasons this happens. Bad knurling wheel axle, dirty knurling wheel, changed pressure or speed, tool became misaligned etc...

Did you use the same tool for all the knurling on this piece? Did you hear/feel any chattering?
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Unread postAuthor: Crna Legija » Wed Apr 11, 2012 7:10 am

jrrdw wrote:Are you making something or is this just a practice piece?


just practice it started off as a 50mm round bar.

There can be a few reasons this happens. Bad knurling wheel axle, dirty knurling wheel, changed pressure or speed, tool became misaligned etc...


it was a brand new, knurling tool i un-boxed it, speed and pressure never changed. Maybe with the pressure it could have moved but wouldn't it have made the hole peace bad?

Did you use the same tool for all the knurling on this piece? Did you hear/feel any chattering?


yep keep on pushing in till i got the right depth then turned on a very slow feed rate.
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Unread postAuthor: jrrdw » Wed Apr 11, 2012 10:32 am

Maybe with the pressure it could have moved but wouldn't it have made the hole peace bad?


Depends, if the wheel rubs the side of it's housing or has enough side pressure at first then centers it's self with rotation it could start off bad then get good.

You should examine the tool next chance you get for scoring due to side load, slop in the wheel at any and all directions etc...
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Unread postAuthor: Labtecpower » Tue Apr 17, 2012 8:17 am

Moar shiny knurled stuff!

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this will also be shipped to jake :)
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Unread postAuthor: jackssmirkingrevenge » Tue Apr 17, 2012 11:32 am

Shineh! good work :)
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Unread postAuthor: Labtecpower » Tue Apr 17, 2012 11:52 am

now I just need my own lathe :D

are you planning on making your own knurling attachment anytime soon?
You'll like the finish you can put on your workpieces :)

Polished the front piece, looks better now :)

Image

I'm happy I was able to finish this thing, my hand hurts like f*cking hell :D
probably broke it last saturday night :roll:
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Unread postAuthor: jakethebeast » Tue Apr 17, 2012 2:21 pm

NICE, shineh! Cant wait to get my hybrid finished :)

Still needing few parts, main thing is the receiver pipe, but i should get it soon!

The chamber electrode is curing atm, some test tomorrow with 10mm barrel :wink:
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Unread postAuthor: jackssmirkingrevenge » Tue Apr 17, 2012 2:29 pm

Labtecpower wrote:are you planning on making your own knurling attachment anytime soon?
You'll like the finish you can put on your workpieces :)


I'll probably get the sherline one for the time being, it's a long time since I bought any attachments anyway :D

Polished the front piece, looks better now :)

I'm happy I was able to finish this thing, my hand hurts like f*cking hell :D
probably broke it last saturday night :roll:


You should see the other guy, right :)
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Unread postAuthor: Labtecpower » Tue Apr 17, 2012 3:19 pm

I'll probably get the sherline one for the time being, it's a long time since I bought any attachments anyway :D


If it doesn't work well you can take it apart and make the design showed :)


You should see the other guy, right :)


Happy I didn't do that, if I hit him my hand would probably have looked better :roll:
a wooden barn is slightly harder, but the brick wall after that was a tad bit too much...

I probably won't have to tell some alcohol was involved...
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Unread postAuthor: Fnord » Tue Apr 17, 2012 8:22 pm

Might as well post this where it belongs...

Fnord needs a part.
Specifically a pulley insert for a drill press. Those of you who have the facilities to fabricate one will already know roughly what I'm after, since it's on top of the spindle in your drill press ;)

I'll get precise dimensions if anyone is interested, but this picture is approximately what I'm looking for. Mine is a little over 1" wide, I believe.
The only part that I'm not sure about is the internal teeth that drive the spindle. Harbor freight presumably gets around the tricky milling by casting the teeth, but it doesn't appear to be working very well.
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Unread postAuthor: ramses » Tue Apr 17, 2012 8:32 pm

Internal splines are a pain in the arse and generally require special tooling (broach).
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Unread postAuthor: cannon monkey » Tue Apr 17, 2012 10:24 pm

i was bout to say i can make that! but then i noticed it needs internal work and i cant do that just yet :(
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