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VN 7 1/2 DIVIDING HEAD

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BROCKWOOD

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#1
Several people told me not to dismiss the Van Norman 7 1/2" Dividing Head. So, when I made an offer on ebay? I won. It came with a tailstock - but shy 2 indexing plates, a few bolts, etc. Show off / document yours here! I was missing 1 of the nuts that allow rotation between the base (mount) the main body. I happened to have 1 that is large enough to require the same size wrench to loosen / tighten as the other 2 stock nuts! Gonna need a spring clip to hold the indexing plate on. Also need a screw to have a complete set of 3 for mounting the indexing plate. So I ordered those in a longer length. The simple indexing plate also uses 10-32 screws in a longer length - but with a slotted head ........... I'll switch those to allen head while I'm at it.

On arrival, mine didn't have a proper backlash. It was repainted all together. Some disassembly was required. Now the backlash is minimal & she rotates beautifully! Needed parts are anxiously waiting their turn on the lathe! Show & share what you have!

20180901_24.jpg 20180901_184857416.jpg 20180901_184914340.jpg 20180930 01.jpg
 

Jason Annen

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#2
My 7.5" is complete. I made a fixture to clone the DH plates, it's a time consuming process though. Chances are you won't be able to find them.
 

BROCKWOOD

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#3
I have a few options for making them. I am certain they will be time consuming though.
 

BROCKWOOD

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#4
I found the 47 - 66 plate. Offered just more than I care to pay - but less than 1/2 BIN. I can make em for myself before I pay what some sell for.
 

BROCKWOOD

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#5
So far $75 per indexing plate is what sellers hope to get. It's called supply & demand. Snap-On, John Deere & Mercedes know this game well. So much for demand for VN stuff as there really isn't any. I'll make my own indexing plates at this rate. I did make my own indexing plate retaining clip for this lit'l 7 1/2 out of a fender washer. I cut the inside diameter, beveled it & then cut the slot. I debated over the order of operation as can be seen in another thread here https://www.hobby-machinist.com/threads/an-order-of-operation-question.73620/#post-617483

The end result:

20181021 05.jpg

Now what to do next? I loathe the idea of collecting VN noC collets at $30 each. Think I'll just get a chuck for it.
 

gi_984

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#6
"Think I'll just get a chuck for it."
I've got one on my shopping list for the 10 inch DH. Looking for a suitable one right now. Per the VN literature they recommend no bigger than a 6 inch.

Did VN recommend a specific size chuck for the 7 1/2 DH?

EDIT: Had it wrong, looked up in the VN accessories catalogue. Recommend a 4 inch chuck.
Did not see a recommendation for the 10 inch. But the factory did not offer a chuck bigger than a 6 inch in the catalogue. So I assume that was what they recommended.
 
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BROCKWOOD

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#7
4" is recommended. Got 1 on the way.
 

gi_984

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#8
Is it a VN brand chuck? Please post pictures of how you attach the chuck.
 

BROCKWOOD

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#9
Will do. It has an adapter to screw on to the DH. Pretty sure it's gonna take a NMTB 50 Adapter for the 10".
 

BROCKWOOD

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#10
Here is a preview from the auction Chris. 20181021 07.jpg
 

gi_984

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#11
Thanks for the picture. Interesting. Looks similar to the pin set up VN used on the 10 inch DH. I've only seen pictures of how a 3 or 4 jaw attached to the DH. I did print out pictures from a machinist who modified a three jaw to fit. I'm planning on doing the same since I can't find an original VN chuck in good condition.
 

BROCKWOOD

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#12
Adaptor screws onto chuck & onto the 7 1/2" DH.

IMG_20181025_214350680.jpg

IMG_20181025_214941913.jpg

Any info you can share on adapting a chuck onto the 10 Vertical Swing DH would be great!
 

gi_984

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#13
"Any info you can share on adapting a chuck onto the 10 Vertical Swing DH would be great!"

Will send you a message with the info. Can also make photocopies and mail to you. Don't have them on digits.
 

BROCKWOOD

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#14
Well, I've bought what are called double sided indexing plates no 371 & 372. They only top out at a 49 hole bolt circle. It will be fun to see what I have in mind for them!
 

BROCKWOOD

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#15
Just cutting to the chase: 1/2" thick double-sided indexing plates really aren't a good solution - unless you are fine with milling 1 side off. My idea was to mill the center thickness only so that the plate would fit. But then, how to add the spring clip? The plate is too tall. But then how to advance the indexing pin beyond it's original reach? Just livin & learnin.
 

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gi_984

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#16
How much thickness wise do you need to reduce? If you mill an equal amount off each side but leave just enough to engage the pin it might be doable. The pin just needs to enough to locate. It really isn't resisting any force. That is if you lock the spindle for each cut.

I'd make a paper template with the numbers on them before cutting. Mill each side evenly (if enough "meat") then surface grind each side for a good finish. Then use the pantograph to replicate the numbers. You could hand stamp the numbers also. Just harder to make it look neat.
 

BROCKWOOD

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#17
gi the pin holes sure seem deep enough to allow for that. An 1/8th off each side would bring them down to the desired 1/4" thick. Thanks. I have number stamps. Worth a try. Pantograph sounds like another fun project too.
 

gi_984

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#18
Let me know if you need help.
 

BROCKWOOD

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#19
Thanks for all you do Chris!
 
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