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Anyone Cutting Spiral Flutes Manually? (sherline Mill)

Lee in Texas

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#1
I saw a website from England in which a guy used a Sherline headstock for a dividing attachment. Makes sense. It already has the right threads for their chucks. He uses dividing plates, but I would think it's fairly straightforward to connect it to a handwheel. Has anyone done that?
 

kvt

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#2
Do you have the link for the web site. I would like to see what he has. Since the hand wheels that I have seen use the location hole in the spindle, it would be a simple thing of finding or making an adapter to hole the plate to the hand wheel, or at least that is what I'm thinking.
 

Andre

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#4
Do you mean connecting the dividing head spindle to the table hand crank, so the table and dividing head spindle move (and rotate) in a fixed relation to each other? Getting old school here!

Cam milling:

Helical gear milling:
 

Rick Leslie

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#5
I've got an old Brown & Sharpe horizontal mill that came with all the gears for helical cutting, but the head is missing. During my research for ideas on a home grown remedy I came across a wooden setup that seemed to work fine. I think it was in Machinist Workshop mag maybe? A quick Google search turned up this little nugget.
http://www.hobby-machinist.com/thre...k-with-manual-mill-drill-this-possible.19572/

My plan is to mod a spindexer and use 5C collets or a chuck.
 

Lee in Texas

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#7
Do you mean connecting the dividing head spindle to the table hand crank, so the table and dividing head spindle move (and rotate) in a fixed relation to each other? Getting old school here!
Yes. I want to get old school...in small scale. I have never seen something like this done on a Sherline. I only found the website with a Dividing Head while searching for a Sherline headstock.
BTW I ordered a Sherline headstock.
 

Lee in Texas

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#8
Found the link. Apparently the author of the article is a member here.

http://bullfire.net/4th_Axis/4th_Axis.html
I have that issue. I read the article again, just a few days ago. I didn't bring it up just because I was thinking of something much smaller. Also- I'm not sure pulleys or sprockets can get the desired reduction ratio in the amount of space available between a Sherline crossfeed handle and dividing head spindle. I think it will need gears. I could certainly be wrong on that, though.
 

Rick Leslie

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#9
I think you're right. The rocker arm in the article had a really tight spiral. I brought it up more for the ingenuity factor. I think some of the principles could be employed to get a shop made set up that will work.
 

Lee in Texas

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#10
Some interesting problems to work out. Making a tabletop sized universal dividing head would be a great project, though. Great for those who don't have CNC, anyway.