These bars are tough stuff!

[abbott295]

I have drilled several bars using carbide-tipped masonry bits in a small bench-top drill press with little problem. Did it in stages, broke a bit or two, but they are cheap enough. Plenty of oil. Your memory may vary.

abbott 295 (Heck, my memory may vary)

 

[4x4American]

I have drilled several bars using carbide-tipped masonry bits in a small bench-top drill press with little problem. Did it in stages, broke a bit or two, but they are cheap enough. Plenty of oil. Your memory may vary.

abbott 295 (Heck, my memory may vary)

i was wondering if they'd work.

 

[john taliaferro]

Bob that's a good catch , mine are only drilled 5/16" with a 1/4" cap head bolt .After reading your post on the brother in law mill where you drilled 6mm .

 

[4x4American]

got the bar back from the machine shop, what a hack job they did there. I think I could have done better myself with a carbide tipped masonry bit.

 

[bigmoose]

I offered to finish it for you. How bad is it?

 

[sachsmo]

Carbide End Mill New 02590 400 5 16" 4 FL de Ball End | eBay

 

[4x4American]

I offered to finish it for you. How bad is it?

I appreciate the offer, they got the holes drilled but they left huge burrs coming out the tail end, it was like they pushed the hole through instead of drilling it through. Took a 4-1/2" angle grinder and leveled it but touched the rivets with it. Oh well, it's still in one piece, the sprocket moves, and the 7/16" threaded rod fits through it just fine.

 

[4x4American]

Carbide End Mill New 02590 400 5 16" 4 FL de Ball End | eBay

shoot wish I found that awhile ago!

 

[lumberjackchef]

I have drilled several bars, modified slots, and tensioner/ oiler holes for dozens of my customers with a handheld dremel and a carbide bit. Maybe not as accurate to drill a sprocket tip but works great and handles the material no problem if you take it slow.

 

[cityslicker]

Are you drilling right through the middle of the sprocket's axis? Can someone explain how it works, I assume there is a void in the exact center?

 

[sachsmo]

Yup!

 

[BobL]

Sachsmo, while the angle of the photo probably contributes to the perception, it looks like your cutters don't have anywhere near enough hook?
Maybe a close up pic of a cutter will help to clarify this?
Cheers
BobL

 

[srcarr52]

When drilling bars I make the pilot hole with a carbide ball tip burr then I can enlarge it with a cobalt drill bit or a straight burr.

 

[sachsmo]

Sachsmo, while the angle of the photo probably contributes to the perception, it looks like your cutters don't have anywhere near enough hook?
Maybe a close up pic of a cutter will help to clarify this?
Cheers
BobL

I use a 7/32 file like on all my full chisel.

I get plenty of hook with full. Yes they don't seem to have much hook, and looking at the pic look rather blunt. (no loving since last use)

Perhaps I should switch to 13/64 for semi milling chain?

 

[BobL]

I use a 7/32 file like on all my full chisel.
I get plenty of hook with full. Yes they don't seem to have much hook, and looking at the pic look rather blunt. (no loving since last use)
Perhaps I should switch to 13/64 for semi milling chain?

That's what I use.
The bottom one in this pic shows what my cutters usually look like.
Will Malloff's is the top pic.

 

[sachsmo]

Dang,

my top plate angle is too much, and perhaps lifting too much?

 

[Stihl 041S]

Motor oil is not the ticket.

You want something to"clean" the surface. Not the best word but to give it bite.