A Challenge for Mr. Young!

[chiloquinruss]

We all know the really cool stuff Bill come up with right? Where is a challenge to see what this toolpath looks like!

http://www.youtube.com/watch?v=SGYTp5EFPVE

Russ

[Brady Watson]

The toolpath is simple...The spindle just sits there, slowly advancing into the work. The action of the tool is completely mechanical in nature, very much like a Geneva mechanism and eccentric.

-B

[don_roy]

so what does the tool path look like.
Don

[Brady Watson]

Again...the toolpath is simple. It is a straight Z plunge into the work, with zero movement of the machine in XY.

The square/eccentric motion of the cutting tool is rhythmically created by a mechanism in the spindle head itself. You could do the same square cuts on your Bot if you had that spindle.

It appears that the tool must be synchronized with the spindle head in relation to the workpiece so that you get squares and not diamonds. 0:19-0:21 in the video shows you the sync/clock position schedule.

Here's a good explanation via YouTube (http://www.youtube.com/watch?v=L5AzbDJ7KYI)

-B

[ssflyer]

Interesting -When it started, I thought there was an inordinate amount of run-out on the spindle. After watching, it looks like they toolpathed it so the spindle was making a small circular motion, so that one of the three flutes cut on the corner on each revolution. I'm impressed by the small radius left in the corners. It is actually a pretty simple calculation and path...

I think you could actually do this on your 'Bot' - -I have to try now...

[tlempicke]

That tool dates back to the twenties or thirties.

[chiloquinruss]

I really do love this forum, what a great bunch of very talented people. You guys are in touch with all the cool stuff, I guess I just need to pay better attention and get in try some of these really cool things. I'm going to give up playing trains for a while and get into some serious 'bot stuff' very cool. Thanks for sharing your expertise and your links to some fascinating sites. Russ

[jerry_stanek]

At times when I need a round hole mine come out looking like those.

[brian]

Kind of reminds me of the Wankle rotory motor.

Brian

[myxpykalix]

sometimes it is simpler to just use a hollow chisel mortiser rather then a shopbot....

HOWEVER...if you had enough holes to have to do i bet one of you smart guys could take working end of a hollow chisel mortiser and adapt a jig to hold it on a spindle or router and then just use a simple drilling toolpath.

The only thought that comes to my mind is the shaft of the hollow mortiser, i think, is at least 6" long creating clearance issues and i'm not sure about the rpm factor:eek: