Engines > From Kits/Castings
Holt 75 from Germany
michelko:
Hi Guys,
the lineboring is done. I am realy happy with the result and how the boring bar worked.
I made some brass plugs to fit in the formerly bored holes at the end s of the case. these plugs had an 10H7 boring to guiede the 10mm drillrod. In the drillrod i made a 3mm hole and 90 degree to that a m3 thhread for an set screw to hold the cutter.
The cutter is ground from an broken mill schaft.
The surface of the bored holes came out realy nice , no chatter or something.
Video crankshaft
http://www.youtube.com/watch?v=-cLmn0B9Tj0
Video camshaft
http://www.youtube.com/watch?v=xMugBVjrcZE
The boring bar and the cases where setup into the lathe for boring.
propforward:
Very impressive work michelko! :ThumbsUp: :praise2:
Admiral_dk:
Hello Michel
I have just watched the video - I knew how it's done, but this is the first time I really could see how well and cleanly the cutter removed the material - thank you :ThumbsUp:
I guess that this is a homemade tool, so did you use any tricks to set the depth of the cut ? And how accurate could you set it for the diameter you aimed for ?
Per
Foketry:
--- Quote from: michelko on January 05, 2021, 11:21:22 AM ---Hi Guys,
the lineboring is done. I am realy happy with the result and how the boring bar worked.
I made some brass plugs to fit in the formerly bored holes at the end s of the case. these plugs had an 10H7 boring to guiede the 10mm drillrod. In the drillrod i made a 3mm hole and 90 degree to that a m3 thhread for an set screw to hold the cutter.
The cutter is ground from an broken mill schaft.
The surface of the bored holes came out realy nice , no chatter or something.
Video crankshaft
http://www.youtube.com/watch?v=-cLmn0B9Tj0
Video camshaft
http://www.youtube.com/watch?v=xMugBVjrcZE
The boring bar and the cases where setup into the lathe for boring.
--- End quote ---
well done Michael :ThumbsUp:
Art K:
Michelko,
I am very impressed with your work on the Holt. I have heard of line boring but have never seen it in action. I have seen George run his at the NAMES show in Michigan. Look forward to seeing yours proceed.
Art
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