dividing head

**tanii51** · 15th October 2010, 01:57 PM

my addittion to boy toy box a 4 inch center height dividing head
1 does any one know what make etc it might be

2 the spindle thread is 1 1/2 x 8 tpi but a hercus plate will only go on 1 turn any clues to why it wont go on ( i tried several different 1 1/2 x 8tpi back plates )
i measure the shaft its 1.5 inches and thread is 8tpi60 degrees

**pipeclay** · 15th October 2010, 02:19 PM

Are you able to measure the Depth of Thread.

**matthew_g** · 15th October 2010, 02:23 PM

G'day there Tanii51, It looks very much like one of the Myford dividing heads. It might b4e worth having a look at www.model-engineer.co.uk or www.evenhomeandworkshop.co.uk for an exact match or model info. I would assume that Myford would have a website that could possiably be of help also..
Hope this helps.
Matt

**tanii51** · 15th October 2010, 10:27 PM

pipeclay the only way i think i can measure the thread depth is mount the spindle in my lathe and measure tool travel from touching outside diam to bottom of thread ..... will this work
john
only pics i can fin don the internet are the plate and indexinglevers look very similar to myford

**pipeclay** · 16th October 2010, 08:46 AM

If you havent got access to thread mics or wires,you could (this is very rough) cut a piece of paper at 60 degrres push it into the thread and mark it with something,you could try a vernier and then take a guess as to the gap left at the bottom,you could even try a bit of plastercine.
Could be a big job pulling the spindle out of the head.
Have you tried a Dog plate,I have found they usually have a little more clearance in the thread.
If you are going to pull the Spindle out of the Divideing Head why not machine up a suitable plate.
If all else fails I can make up a small test piece with 1 of my threads send it over if it fits keep it then I can sell you a plate or plates.
With the piece of paper,if you go that way,after marking the Divideing Head depth compare it to your lathe Spindle thread and see if the mark lines up with that thread.

**tanii51** · 16th October 2010, 10:17 AM

got the spindle out of the head but cant do any more till next week .... work calls

my plan was to fit a thread tool and by hand touch the outer side .. take a reading then manually move the tool into the next thread bottom and take a reading and check the difference

**pipeclay** · 16th October 2010, 10:23 AM

Depth should be around .065"

**tanii51** · 17th October 2010, 03:27 PM

problem solvered the thread depth too shallow i deepened it manually on the hercus a little at a time using hand wheels not probably the right way to do it but i didnt want to stuff up with the machine running
now to study up on how it works
thanks for your help guys
john

**Anorak Bob** · 17th October 2010, 11:23 PM

Looks like a Tom Senior dividing head. Have a look at the G and M tools website.

Bob.

**tanii51** · 18th October 2010, 09:32 AM

thanks bob yes thats it and i should have known considering where it came from they had a tom senior mill

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