Does anyone have any info about these vices

[bjcolyerParticipant @bjcolyer]

Hi Andrew

That’s really interesting – thank you for digging out those 1966 drawings!

Given that I’m measuring my grub screw with a fairly basic vernier caliper, 3.2mm/3.3mm could easily be a slightly off reading for a 4BA (3.6mm).

The only other major discrepancy is that my grub screw is 3/8″ long not 1/2″. There could be several explanations for that:

1. Maybe the vice underwent a small design change between 1966 and 1971?

2. As the grub screw is not a component we were required to make ourselves, maybe this was the only length available “in stores” that day?

Out of interest, do those 1966 drawings give the O/D and I/D (bore) dimensions for the collar? If you could share those, I can cross-reference them against my collar to see if their was a design change.

In fact, if it is not a breach of rules for this forum. Would you be able to share those drawings with me?

Thanks for your help. This may be a breakthrough!

Barry

 

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