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Pillartool

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Redpiperbob01/01/2010 16:40:50
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92 forum posts
41 photos
Hello all
Could someone help me out please. I am just starting to build the G H Thomas Pilllartool. In the book Workshop techniques he states that the brass clamp pads should be parted off at 1.5" and yet the longest in the plans is 3/4"
Am I missing something or should I just past off at a tad over 3/4"  and 11/16". It seems a bit wasteful of the brass. (Thats my Scrooge side coming out.).
Any help will be gratefully appreciated.
Bob
mgj01/01/2010 17:29:29
1017 forum posts
14 photos
I dont know the UPT, and whether you are working form plans or his book. So I apologise for Grannies in advance.
 
Having built his VDH, the procedure for the clamps is as follows. 
 
1. Turn the brass clamps to long size - see drawing for depth of hole .
2 Mark and drill the clamp holes.
3 Insert clamp blanks and lock down - drawing will show a screw hole between the pair of clamps,which is later blocked off  for pulling a locking bar down - make from scrap. Or use a g cramp(s) if that suits.
4.   Then bore the hole with clamps installed - you will take out the 1/2 moons in the clamps and have them all to size in one move.
5 Extract clamps, part off halves to length and insert counterbores and screw threads in appropriate halves.
6. Centre pop for identification because the clamps are "holed". (Like only fit that hole)
 
 
DON'T try to do the bore first and then judge the cutouts in the clamps because you will never get it right, or in the right place. GHT's way you have a perfect fit, and a guarantee that all will line up when a clamp is bottomed in its hole.
 
 
 

Edited By meyrick griffith-jones on 01/01/2010 17:30:40

Edited By meyrick griffith-jones on 01/01/2010 17:32:22

Redpiperbob01/01/2010 18:37:50
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92 forum posts
41 photos
Hi Meyrick
Thanks for the resonse I also have built the VDH but the pads on the pillartool are different as they only go half way thourgh the arm and base castingsthe depth of the counterbore to take the pads is 3/4" and 11/16" so I thought if I make them that size and when I have drilled the  bores I can take them back out and then file a small amount of the bottom of the pads to make them grip the shafts that run though the bores. I can scan the pics but I dont think I should put them on the site (Copyright).
Bob
mgj01/01/2010 19:41:45
1017 forum posts
14 photos
Bob - I do apologise.
 
The only comment I could fairly make is to say the GHT wasn't known for errors on his drawings. 
 
Having said that, looking at Dividing and Graduating (out of print now - I think its been incorporated into a bigger volume) there are drawings of part of a UPT showing the clamps on the inboard side of the column and staking head. Using I imagine the VDH type. of clamp.
However, the photo shows a UPT with the clamp bosses on the outside, using just a split in the bracket.
 
So perhaps you pays your money and..... depending on which castings you have?
 
 
John Haine01/01/2010 20:23:51
5563 forum posts
322 photos
When I do cotters I make both halves separate (for a split cotter) and clamp then in their bore with a thin washer in between, then bore the main hole for the thing they're clamping.  Then you don't have to part the cotters, just remove the washer.  For a single cotter put the washer at the bottom of the hole.
Redpiperbob02/01/2010 08:18:18
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92 forum posts
41 photos
Hi All
Thanks for the replies I thought I would show you the way GHT has draw the pads in his Workshop Techniques book.
 
one piture is woth a thousand words. I hope this expliains better what I mean
Thanks Bob
David Clark 102/01/2010 10:14:39
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3357 forum posts
112 photos
10 articles
Hi There
In the pillar tool book the sizes are 11/16 and 3/4in. long.
 
You machine them with the bores then remove them and turn 1/4in. off the length.
 
I would use 1/4 spacers and 7/16 and 1/2 in. long slugs then throw the 1/4 ones away.
regards david
 

Edited By David Clark 1 on 02/01/2010 10:15:32

Redpiperbob02/01/2010 10:22:13
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92 forum posts
41 photos
Hi David
Thank you for the reply. I am going to do them as your first suggestion.
soon find out just going to start now.
How are you enjoying the snow up here.
Bob
David Clark 102/01/2010 10:48:02
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3357 forum posts
112 photos
10 articles
Hi There
Very little snow.
Bit of ice left but nice blue skies.
Bit too far north for much snow.
regards David

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