Cutting crown

[Tim Singleton]

im using Arthur Warner holders with HSS inserts in a boring bar. I'm using this insert
http://www.arwarnerco.com/p-124-cemw-2-15-5.aspx

My tool sharpening is really rusty. My machining training was over 30 years ago so the tool grinding for crowning anyway is out

What are you guys using to cut your crowns?
I'm cutting flat target crowns

 

[ab_bentley]

im using Arthur Warner holders with HSS inserts in a boring bar. I'm using this insert
http://www.arwarnerco.com/p-124-cemw-2-15-5.aspx

My tool sharpening is really rusty. My machining training was over 30 years ago so the tool grinding for crowning anyway is out

What are you guys using to cut your crowns?
I'm cutting flat target crowns

I'm using a micro 100 solid carbide boring bar.

Adam

 

[martin22250]

im using Arthur Warner holders with HSS inserts in a boring bar. I'm using this insert
http://www.arwarnerco.com/p-124-cemw-2-15-5.aspx

My tool sharpening is really rusty. My machining training was over 30 years ago so the tool grinding for crowning anyway is out

What are you guys using to cut your crowns?
I'm cutting flat target crowns

I bought a used set of bits off of ebay, this one I use on my crowns I lightly sharpened it after receiving it. Don't know if it is exactly right for the job but seems to work I have basically no machine shop training. The crown in the picture is just a stub I practiced on

 

[Riesel]

Brownells part # 080-586-750WB with correct brass pilot. Also have their lathe tool bit and it also works well.

 

[hoz53]

im using Arthur Warner holders with HSS inserts in a boring bar. I'm using this insert
http://www.arwarnerco.com/p-124-cemw-2-15-5.aspx

My tool sharpening is really rusty. My machining training was over 30 years ago so the tool grinding for crowning anyway is out

What are you guys using to cut your crowns?
I'm cutting flat target crowns

I can make a straight turning tool out of the Arthur Warner 5 piece kit work well for a target crown. My machining experience is minimal.

 

[Alex Wheeler]

http://www.grizzly.com/products/Sol...mm-Shank-Right-hand/T10248?utm_campaign=zPage

Crowns and boring muzzle brakes. Leaves a beautiful finish.

 

[boltfluter]

+1 for the Micro 100 solid carbide boring bars. Razor sharp and made in Idaho.

Paul

www.boltfluting.com

 

[hogpatrol]

View attachment 991878
I bought a used set of bits off of ebay, this one I use on my crowns I lightly sharpened it after receiving it. Don't know if it is exactly right for the job but seems to work I have basically no machine shop training. The crown in the picture is just a stub I practiced on

Same thing I do. Grind the tool bit, set a skosh above center and cut from the bore out. Polish with some emery and cutting oil.

 

[clowdis]

Tim,
If you're cutting recessed crowns with sharp edges on the lands and grooves you can get by with a lot of different cutters as long as they are really sharp. If you want to cut 11 degree crowns and break the edge on the rifling with a 45 degree chamfer then I find it's best to use a small boring bar. I use a high speed steel bar with the edge about 3/16 inch wide and sharpen it with a lot of angle to clear the smaller bores. Another tool for putting a chamfer on a bore is a sharp countersink, but be careful.

 

[Tim Singleton]

Tim,
If you're cutting recessed crowns with sharp edges on the lands and grooves you can get by with a lot of different cutters as long as they are really sharp. If you want to cut 11 degree crowns and break the edge on the rifling with a 45 degree chamfer then I find it's best to use a small boring bar. I use a high speed steel bar with the edge about 3/16 inch wide and sharpen it with a lot of angle to clear the smaller bores. Another tool for putting a chamfer on a bore is a sharp countersink, but be careful.

I've been using a small boring bar with a hSS insert. Cutting a flat target crown. It's doing good. The inserts I have are getting a little dull
So I thought I would see what you guys were using

 

[Preacher]

I've been using a small boring bar with a hSS insert. Cutting a flat target crown. It's doing good. The inserts I have are getting a little dull
So I thought I would see what you guys were using

Take those inserts and lay them cutting side down on a piece of 500 grit wet=dry and lightly move the insert around in a circle applying pressure to it...
They do sharpen up nice that way......

 

[ridgeway]

Short 3/8" shank micro 100 boring bar and spin at high speed. Easily touched up with diamond...

 

[ab_bentley]

Short 3/8" shank micro 100 boring bar and spin at high speed. Easily touched up with diamond...

Diamond wheel is the way to grind. Whether HSS or carbide, but these little micro 100 bars are the bomb, especially @ $19 per bar.

Adam

 

[swd]

Ad

Diamond wheel is the way to grind. Whether HSS or carbide, but these little micro 100 bars are the bomb, especially @ $19 per bar.

Adam

Adam, where can you get them for $19? Thanks.

 

[ab_bentley]

Ad

Adam, where can you get them for $19? Thanks.

Ebay my friend, ebay. Just bought one last night, $21 shipped I believe.

Adam

 

[tonyb]

Ebay my friend, ebay. Just bought one last night, $21 shipped I believe.

Adam

Would you mind leaving a link please?

Thanks!

 

[ab_bentley]

Look at this on eBay http://www.ebay.com/itm/351879119505

Adam

@tonyb @swd

 

[Steelnecktie]

Same as preacher with HSS insert. Flip it over on cutting side on nice wet stone. Always very sharp.

 

[tonyb]

Look at this on eBay http://www.ebay.com/itm/351879119505

Adam

@tonyb @swd

Thanks Adam!

 

[tclaunch]

im using Arthur Warner holders with HSS inserts in a boring bar. I'm using this insert
http://www.arwarnerco.com/p-124-cemw-2-15-5.aspx

My tool sharpening is really rusty. My machining training was over 30 years ago so the tool grinding for crowning anyway is out

What are you guys using to cut your crowns?
I'm cutting flat target crowns

I use Arthur Warner tooling and have compared HSS and carbide. I like the convienience of carbide on a recessed crown to get it shaped and angles in place, like on a live varmint or hunting rifle, but always use HSS on the finish cut.