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123 blocks

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HS93:
Ok I have read this post several times and even spoke to bogs about it and  Had a thought could you not simmply make a couple of special bolts that have the correct thread for the 321 blocks then has a shank that will go through the holes and the the end is threaded on the part that goes through the non threaded part of the block ok the nut will be one size smaller than the main .

sorry about the sketch

peter

Miner:

--- Quote from: doubleboost on June 17, 2011, 09:13:09 PM ---Unc &Whit are very similar but not the same (they are both crap)Compared to the metric equivilent  :doh: :doh: :doh:
At least metric comes apart after a few years  :D :D :D :D
The most commonly snapped tap must be 1/4 whit

--- End quote ---

Sorry to nit pick and this is a long ways away from this threads topic but I'm curious and really can't understand this comment. I've run very heavy duty mining equipment for most of my working life, Some of it weighing up to 2000 tons and the majority of it had UNC bolts and threads holding all that weight togeather along with the working stresses involved while operating it. I'll not argue about the theroetical superiority of Metric verses Imperial, Nor do I want to get a bunch of differing opinions about either. But somehow a 60 degree Metric thread form is superior to the Imperial 60 degree thread form so UNC is crap? Metric comes apart but UNC doesn't? Yeah I know you were probably joking but? I do the majority of my work in my shop with Imperial threads so maybe there is something I don't know about Metric.

Pete  

Bogstandard:
Peter,

You are quite right about making a stepped bolt, and I suppose it might be more accurate and less inconvenient.

The normal way to get around the problem is to use a smaller bolt that goes right thru both tapped and untapped holes.

Your way would do away with having an extra bolt head or nut on one side of the assembled blocks.


John

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