Gunsmith leaves burr on crown??
- Thread starter uncledillers
- Start date
It was done in a lathe, with a not very sharp, not very rigid tool.
The pattern in the lines in the pictures looks like the tool was chattering a fair bit. Could have been from not being sharp, could have been chipped, maybe a bad relief angle...Lots of ways to get a lousy finish with chatter. Unless you are trying to repeat it, in which case, never the same twice!
Cheers
Trev
Gotcha. I don't think I've ever seen that chatter pattern on an end cut on my lathe. I've seen the ring finish like that but would have blamed it on the opposite, with my lathe -- too sharp hss with too high rake at too slow an rpm!
- Location
- Union Bay Vancouver Island BC
This is how Tikka does it.
Not sure if its functional but it sure looks pretty!
Not sure if its functional but it sure looks pretty!
It may be that the 11° crown is featured primarily on target barrels. I know that Anschutz uses this crown in their rimfire target rifles (but also on their M1770 .223 hunting model), and Lilja's drop-in rimfire barrels feature the 11° crown.
gstprecision
Regular
- Location
- Frankford, On
Burr on the crown eh? Yeah, I've had that happen to me too.
Holy smoke, that is worst than everything I have ever seen.....
I know, right? How does that even happen? I had another shop fix it and provide before/after photos. The first guy refused to fix it. Best of all I brought the rifle in for headspacing and didn't even want any crown work done!
gstprecision
Regular
- Location
- Frankford, On
That is sad to hear, first you should never give a client sub-standard work. He should have at least offered to fix it for free.....
GST
GST
The 11 degree crown was all the rage for a while and some still try to sell it but there is truly no demonstrable difference. Finishing the crown with a 60 degree cutter, as Dennis described, is a fine method and produces a crown which is much less susceptible to damage from cleaning than is the flat, sanded, crown. The fit of the pilot is not super critical if the set-up is true since the reamer will cut to center unless forced off. I like the 60 degree cut to finish the crown and have always done my own that way. I have some rifles with 11 degree crowns but I finish these with the center reamer as well.
