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1-2-3 or 4-5-6 Blocks

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bogstandard:
If you bring one around with you on your next visit Stew, we'll have a root and see what we can come up with.

John

sbwhart:
Thanks  John

Will do

Stew

John Stevenson:
Short potted history on 1-2-3 blocks.
I was born at an early age -- sorry got side tracked.........

The original 1 - 2 - 3 blocks had a series of tapped holes and a series of clearance holes, they were made for toolmakers, often as apprentice test pieces, to function in various but non defined ways.
To be used as parallels, to be use bolted together to form angle plates, to form tee plates and to bolt objects to for holing in primary and secondary operations.

In short they had no defined use on one hand and every defined use on the other, long short is they were handy to have around and use as it suited, full stop.

Then the excrement hit the whirly thing and someone , probably in Taiwan either made a wrong drawing or copied a bad set of blocks, the result being that what were clearance holes were then done as tapping size holes for the threaded holes in the plate, usually 3/8" BSW  or UNC because of the age of the originals.

This meant that they couldn't be bolted together as the original ones were, they couldn't be redrilled because they were hardened and the end result is mainland China and India has religiously copied these so there are 632,763 [ approx ] copies out there that are wrong.

Plans are afoot to get some sets made correctly with metric holes and clearance holes but they will take a while to filter thru.

JS>

Darren:
Thanks Gents, that cleared that one up.

I wondered if it were to do with shipping costs  :lol:

I have seen some with no holes in at all. Shouldn't they be called parallels then  :scratch:

websterz:
Never seen a 4-5-6 block...just 2-4-6's. What else have I missed out on? :doh:

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