09-01-2012, 02:51 AM
(03-09-2012, 12:13 PM)DaveH Wrote: Here's mine,
I could never find the spanner, so got rid of the nut.
I used a thrust washer (bearing)
DaveH
Hello Dave legendary idea Dave,
I despise the tendancy for all toolpost designs to twist just a smidge during the tightening process, surely a needle thrust race fixes this problem once and for all, After I check the load bearing capacity of the needle races I will be adding this idea to each of my lathes as well as any other machine with a toolpost and I think the lock lever on my radial drill as well as the clamping nuts on my tailstocks could use some help as well.
Some folks will know, others will realise when it's pointed out, but might not have realised that the effectiveness of clamping bolts is greatly reduced by friction particularly the friction on the vee threads where the pitch form angle multiplies the frictional forces but also about 30% of the clamping force is used up overcoming the friction under the nut or bolt head, the needle race should give back this loss.
Regards
Rick
Whatever it is, do it today, Tomorrow may not be an option and regret outlasts fatigue.