3/4 vs 20mm

[tvrgeek]

Back to the standards. Ok, my bench and assembly table are both drilled for 3/4 inch. Pile of dogs etc. Some newer nifty accessories are 20mm. Simple dogs won't help, but they are not expensive. Question is, before I drill my bench, does the extra mm in the hole have much effect on my great steel bar foldfasts? Bench is 5 inches thick.

 

[pop-pop]

Sounds like a one hole 5” mockup from scraps is in order for a quick test. My guess is probably ok.

 

[Rwe2156]

Can’t see how it would.

5” thick bench? What are you doing on it, son?

Seriously there’s too thin and too thick for holdfasts. Is there enough tilt on a bench that thick to bind it well?

 

[tvrgeek]

SYP, Mass. Heavy enough it does not move when I plane something. The cheap cast hold-fasts did not work, but my good forged ones work fine.

 

[Ricksmi]

IMO I would think not, my holdfast seems to work well in 3/4 holes on my main work bench and works just as well on the Sjoberg which has 20mm.

 

[Gofor]

I would expect your holdfasts to work fine in a 20mm hole. My holdfasts were made from 3/4" round stock, and were a bit tight in the 3/4" holes which I "wallowed out" some.