Post by savannahdan on Nov 16, 2018 11:44:52 GMT -5
During a long 3d carving I had a bit that took a dive. Upon inspection it looks like there was something going on between the bit shank and the collet. When I looked at the collet nut the fit and finish was very lacking and it appears to have had balance adjustment drill holes that also appeared to be lacking. I had purchased some of Precision Bits collets and collet nuts for a different system and felt they gave me great performance so I ordered a new collet nut from them. I put the 2 nuts side by side to make a comparison and noticed how the original showed a rough finish on the inside where the collet makes contact and the Precision Bits nut was much more refined. An outside view shows the balance adjustment holes that were drilled and the original were crude and looks like I did it by free hand. The Precision Bits nut adjustment drill holes were much more precise presenting. The real test came from use. I have cut more than several jobs with the new nut and haven't had any issues. I did notice that it is shorter in length than the original nut. Sorry for the bad quality of pics, my cellphone has a cracked lens covering. The first photo shows the internal shot (Precision Bit nut on bottom and you can sort of see the rough finish on the inside of the original nut) and the second photo shows the balance adjustment with the Precision Bit nut on the bottom and the original nut on the top.
I also had problems with the original collet nut. I replaced them (I have one for 1/4" and one for 1/2" collets) with Precision ER20 Nuts from Amazon. A very worthwhile upgrade. Also clean out the collets with compressed air after a long job.