In all the years Ive been a machinist I've never had 1-2-3 blocks ,so thought I would get a set or two , I could use them for setup and maybe a quick and dirty angle block ,so I purchased a couple sets of these 123 blocks from Shars Ebay site. They're cheap enough so if they are crap , I havent blow a whole lot of dough on them .My impression was that the bolts in the kit were for fixing the blocks together , but the untapped holes in these blocks are not clearance holes for the bolts ,I reckon they are drilled tapping size for the 3/8"
On thier Ebay page they state that the holes are through holesHere's me thinking that the holes would be clearance for the bolts supplied in the kit. I guess they are correct in one sense the holes do go through the block , but the bolts won't go through the holes.
I have a pair of 2-4-6 blocks with 5/8 " threaded holes ( chinese manufacture) and the untapped holes will allow a 5/8" bolt to pass through.
I sent a query to Shars and they say they have been selling them for years and no one has ever brought this up with them ,and that they are made to American standards .
If the blocks are not meant to be bolted together , why do they supply bolts in the kits.?
Of course modifying them and drilling the holes out to clearance will very difficult as they are hardened and a cobalt drill won't even look at them.
Can anyone enlighten me on this , I thought I read some where that the original Starrett blocks were able to be bolted together .
Thanks in advance for any information .