P89DC wrote:Doug Reid claims the first 10" saws came out in the 50s. He's wrong. Delta Unisaw came out around 1939 with a 10" blade and a 5/8 arbor. Unisaw is a commercial saw, not a hobbyist rig.
If you want to constrain your saw blades to 1 1/4" it's not my business. Just don't think you've increased performance by using it. All you've done is limited your choices and upped your cost.
I agree...I don't know if there is much, if any benefit to running the 1 1/4" arbor on a 10" blade versus the 5/8" arbor (at least based on my own limited observations with each arbor size). I believe commercial blades often don't jump up to this larger arbor size until 12" and above here in the US. However, in the UK, I believe they typically run 250mm blades with 30mm arbor sizes (1.18"), so there must be some engineering calculations behind the choice to go to a 1.25/1.18" arbor size on a 10" blade. Maybe these are just over-engineered, but since multiple saw manufacturers appear to have gone this direction, there must be more to it than just pre-existing tooling dimensions.
Just curious if any of the esteemed forum members here might know some of the history behind this decision by Shopsmith on the 1-1/4" arbor size and could share it with us. Any recorded or verbal history passed down on Shopsmith's decision here?