3/16" carbide insert boring bars

Kim Bye

Kim Bye

AzB Silver Member
Silver Member
I need a fairly long and thin boring bar for joint pin installs, The solid carbide ones from Micro100 are a little short, so I have been looking at those 3/16" 4" long boring bars that use regular inserts.
I have never used on of those 3/16" boring bars befor and wonder if they are any good for pin installs or do they flex, and thus making inaccurate holes?
 
Have you got a link to what you were looking at ?
I have seen about 5mm diameter inserted carbide bars, but they are only about 35mm long for the boring length, about 7 to 1 bore to length ratio. These are intended for steel though. With a 0.1mm or 0.2mm nose radius insert , even at 50mm or 60mm long will be ok for wood etc. Carbide still moves and flexes quite a bit really and can be deceiving to think that it does not bend or move around.
Neil
 
conetip said:
Have you got a link to what you were looking at ?
I have seen about 5mm diameter inserted carbide bars, but they are only about 35mm long for the boring length, about 7 to 1 bore to length ratio. These are intended for steel though. With a 0.1mm or 0.2mm nose radius insert , even at 50mm or 60mm long will be ok for wood etc. Carbide still moves and flexes quite a bit really and can be deceiving to think that it does not bend or move around.
Neil
Click to expand...

I'll post a link later today, the overall length is 4 inches, so that sould be long enough for all kinds of joint pins.
It's the flex I'm worried about. The boringbar is about $100 so it's not a huge investement, I believe it's made by Kennametal.
 
Solid carbide boring bar

I believe that I have what you are after - however, it will need to be resharpened - so if you have the resources to make that happen - let me know //pfdrexler@comcast.net// - how does $50.00 plus shipping sound ??

Paul

ps. and yes the solid carbide is much more rigid than the set up with inserts.
 
conetip said:
Have you got a link to what you were looking at ?
I have seen about 5mm diameter inserted carbide bars, but they are only about 35mm long for the boring length, about 7 to 1 bore to length ratio. These are intended for steel though. With a 0.1mm or 0.2mm nose radius insert , even at 50mm or 60mm long will be ok for wood etc. Carbide still moves and flexes quite a bit really and can be deceiving to think that it does not bend or move around.
Neil
Click to expand...

Good morning Neil.
You sold me a .250 x 6" boring bar for pins and more.
This was about 6 years ago. If you still have a source
for more. I would buy another one.
Thanks Frank FC3
 
Hi Frank, I still have the Carbide double ended boring drilling tools. I have run out of the packers for the Taig Tool posts though and need to get more of those made.
I'll send you a PM.
Neil
 
^^^ There ya go Kim. ^^^ Seems that those would fit the bill nicely if you don't fret the cost.
Super-Duper accurate boring and at various lengths.
Some advice though, move quickly before the wood moves on you. Lol
 
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