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Thread: making small boring bars
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4th May 2010, 02:08 AM #16Intermediate Member
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I've just recently made my first boring bar and it worked a treat. However I also would like to make smaller boring bars. The one I made needs a 13mm hole to start off.
Pipeclay mentioned an interesting method which appeal to my sense of cheapness. Welding, brazing, soldering a piece of HSS to a bar.
Question though, will the heat of welding not be so high that it affect the properties of HSS?
Brazing may be better but I'd prefer to weld it. My budget is tight and OA and brazing rods is kinda luxury these days for me.
Regards
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4th May 2010, 02:30 AM #17GOLD MEMBER
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Cant say if the heat put into your HSS from welding will effect it,I have never had a problem when it has either been stick or mig welded.
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4th May 2010, 04:42 PM #18Intermediate Member
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Thx, Pipeclay. I'm going to try that.
Regards.
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8th May 2010, 07:41 PM #19Boilermaker
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I dunno how others have gone but I have never had much luck using drill bits in a lathe situation. I have found that the shafts from worn taps are very good. I have a round bar with perpendicular fitted tap at work that does a great job - needs a 25mm hole to fit it in though, used to cut a 38mm hole in 2" 316 solid bushes. Have a insert boring bar for that job now fortunately.
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14th May 2010, 02:03 PM #20Intermediate Member
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Hi Tiger
Just reading all of the input to your question and thought I would add a little just to create more confusion.
When boring small holes not too deep, I would just grind up a suitable shape using solid HSS. I have bored holes and tapered holes in tool steel probably down to 6mm in Dia. Solid High speed is a very rigid material. See photos of some old stuff found in the bottom of the box as most of my really small ones must have been borrowed.
For other awkward jobs I have brazed HSS tips on to various shanks using silver brazing alloy 45% silver currently around $5 to $8 a stick. just keep the heat low. I found the brazing only reduced the hardness to around 60 Rockwell C. Good luck and have fun
Ray
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17th May 2010, 11:58 AM #21
Thanks, Ray, that was helpful particularly the photos. Am interested in how you did the brazing, how did you hold the small cutting tip on the steel shank so that it doesn't move when you brazed?
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