building the gingery dividing head

Home enthusiasts discuss their Foundry & Casting work.

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norman
Posts: 50
Joined: Tue May 18, 2010 5:16 pm

Re: building the gingery dividing head

Post by norman »

I finished the dividing head so here is some photos of the project
this is the plate with the most holes
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boring one of the plates
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the fixture for mounting the plate on the dividing head is also used on the lathe to machine them
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start of drilling the indexing holes once all 3 plates are done I'd drilled close to 500 holes took about 5 hours
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Last edited by norman on Sat Jan 22, 2011 10:59 pm, edited 1 time in total.
norman
Posts: 50
Joined: Tue May 18, 2010 5:16 pm

Re: building the gingery dividing head

Post by norman »

all 3 plates are done I also have 1 undrilled extra plate not shown.
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each plate has 6 rows drilled and each row is indexed using the strips of paper glued to the rim
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this is the cast tail stand for the dividing head
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completed dividing head
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norman
Posts: 50
Joined: Tue May 18, 2010 5:16 pm

Re: building the gingery dividing head

Post by norman »

completed tail stand on the mill. I'm milling a gear testing out the dividing head
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view over the tail stand in my hurry to try it out I didn't center the cutter so I ended up with a gear with its teeth leaning to the right. Good news is the dividing head indexed all the way through and ended up right back where it was supposed to be
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the gear will go into the scrap bin and get remelted
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I put a cover over the gear train to keep the chips out.
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norman
Posts: 50
Joined: Tue May 18, 2010 5:16 pm

Re: building the gingery dividing head

Post by norman »

Couple of views of the dividing head
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the sector arms are necessary to keep you from getting lost on the hole count
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you can see the high tech cover in this shot,so I made an aluminum one once I'd finished the test gear. :roll:
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just another view of the lopped sided gear. It took 30 minutes from start to finish of the gear
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The dividing head is on my home made mill (Gingery design)
For less than $100.00 I have a dividing head which will work for me I had a great time building these machines, Mill,Shaper,and the dividing head plus all the cutters.
SteveM
Posts: 7763
Joined: Mon Jun 27, 2005 6:18 pm
Location: Wisconsin

Re: building the gingery dividing head

Post by SteveM »

How did you index the plates to drill the holes? It's kind of a chicken and egg problem.

Steve
norman
Posts: 50
Joined: Tue May 18, 2010 5:16 pm

Re: building the gingery dividing head

Post by norman »

Steve
I have a photo on the first page of using the indexing strips glued around the rim to guide me on drilling the holes. There is a cursor clamped close to the rim of the plate that guides me as I drill Gingery show how to make the strips he calls it dropping perpendicular lines.
If your worried about perfection then you probably won't try building a dividing head.
For me as its a hobby, I do not worry about perfection and don't plan on building anything for NASA. For my use this thing works great. It was a real fun project and was not that hard to make.
SteveM
Posts: 7763
Joined: Mon Jun 27, 2005 6:18 pm
Location: Wisconsin

Re: building the gingery dividing head

Post by SteveM »

norman wrote:I have a photo on the first page of using the indexing strips glued around the rim to guide me on drilling the holes. There is a cursor clamped close to the rim of the plate that guides me as I drill Gingery show how to make the strips he calls it dropping perpendicular lines.
OK, I see. You are using the strips for the divisions, and each circly uses a different strip.
norman wrote:If your worried about perfection then you probably won't try building a dividing head.
For me as its a hobby, I do not worry about perfection and don't plan on building anything for NASA. For my use this thing works great. It was a real fun project and was not that hard to make.
I have a Pratt & Whitney dividing head and I managed to find one plate for it. I may try to sit down and see what circles on the other two plates can be done from that one. Probably a succession of doing what I can do on the one, then using the other two partial plates to do the rest. Not a big priority right now. Too many other things to do.

Nice job on the head. Looks like it was a fun project.

Steve
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acourtjester
Posts: 1
Joined: Thu Aug 16, 2007 9:40 am
Location: Pensacola. Fla

Re: building the gingery dividing head

Post by acourtjester »

HI
I built one of dave's dividing head back in 1986 and broke it out to make some gears the other day.
I made a foot controller and used the gears to rotate a pot.
here is a youtube of the foot pedal its the second one on the video.

have fun
Tom
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