12-11-2013, 08:48 AM
(12-10-2013, 10:41 AM)dallen Wrote: I have one of the standard aloris parting blade holders and I can never stop the blade from slipping.
DA
I've heard of that happening with the import ones. I do not care for either the cam type nor the single wedge type, for two reasons. First, I believe the single point of contact puts a stress riser on the blade, making it a likely failure point. Secondly, the small point of contact offers minimal clamp pressure as compared to the long line of contact in the style holder I choose to use. When tools aren't held rigid, they move. When cuttings tools move opposite of the intended, they fail.
The blocks I have are known as 7-71 and 7-71C, and both Aloris and Dorian sell them. You may notice one has a shiny new clamp block. My dad had made that because the original one was broken in half when I bought it off eBay for cheap. I can only assume the original owner tried to tighten all four screws while holding only a half long blade.