Gunsmithing M40a1 crown

[grunt0311]

What is the correct crowning tool to do the crown? I have seen some on brownells but I wanted to make sure that I am getting the correct one. If everyone knows please let me know. Thank you

 

[BLAWTON]

Re: M40a1 crown

Best way is to put it in a lathe and a four jaw of some type. Next best way is a piloted 11 deg center.

 

[wnroscoe]

Re: M40a1 crown

Most grind their own tooling to some degree with relief and angle to suit. I use a brazed on tip tool for crowning ground to a certain angle. HSS works just as well. A lathe with a four jaw and spider works best.

 

[grunt0311]

Re: M40a1 crown

Would any of these tools be the one that we are talking about?

http://www.brownells.com/.aspx/pid=717/Product/BARREL_CROWNING_LATHE_BIT

http://www.brownells.com/.aspx/pid=18298...R___BRASS_PILOT

http://www.brownells.com/.aspx/pid=18298...R___BRASS_PILOT

Does anyone use these at all?
Thanks

 

[wnroscoe]

Re: M40a1 crown

#1 looks like HSS, ditch #2 & #3. You can buy Rex95 in .500" and grind your own to match tool #1 that you've shown.

 

[eddieharren]

Re: M40a1 crown

Never seen an M40a1 with an 11 dgree crown.

 

[WRM]

Re: M40a1 crown

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: DocEd</div><div class="ubbcode-body">Never seen an M40a1 with an 11 dgree crown. </div></div>

+1 - Deep recessed perpendicular....