Re: Geometric Self Opening Die Heads

"Bob La Londe"  wrote in message news:v770jj$1fv4f$1@dont-email.me...
On 7/16/2024 4:33 PM, Jim Wilkins wrote:
Yeah, at a little over 2 bucks a piece for the cheapest ones in the
right size I'd modify hardware store bolts too.
https://www.mcmaster.com/products/bolts/fastener-strength-grade-class~sae-grade-8/thread-size~3-8-16/length~4-1-2/
Bob La Londe
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I gave the approximate length for simplicity, actually they are threaded just far enough to keep all shear loading on the full diameter shank with only enough axial clearance to minimize cantilever loading and avoid binding when the locking flange nut is snugged. I may have to leave more shank to fit the stronger chain. The Grade 2 4-1/2" bolts didn't have quite enough shank length and one showed thread damage when removed.
This is more fussing than I would design into a commercial product unless higher performance justified it. I've been the tech doing that custom adjusting, like cutting coax cables to length to match the propagation delays, the timing error tolerance was equivalent to around 1/16". They were for a machine that tested computer memory chips for speed and errors before they were cut from the wafer.
At the start of WW2 when we took on the manufacture of foreign designs, the Merlin engine and Bofors AA gun, we found that hand fitting was still common in Europe.