Gallery, Projects and General > Project Logs
Webster IC Engine build log.
kwackers:
I made a vernier adjustment for the cutters on my boring bars, but one thing about the tailstock not needing to be centred is that (assuming the cutter is aprox in the middle of the bar) then for every thou you move the tailstock off centre you'll increase the diameter of the bore by about a thou. So could be a good way to fine tune the bore size.
NickG:
That's a good idea and that angle shouldn't make any difference to the cutter angles.
Nick
raynerd:
Here is a little update, only had a few hours on this over weekend but just enough time to turn the bore and I`m absolutely chuffed to bits. It worked a dream and there is no sign of a taper. I have even turned up a little go-no/go bar and it works perfectly on both ends and of course measuring shows the same. I have to admit that it took a bit of getting use to and confidence/trust in measuring it but I couldn`t have done it without my measuring tool - cheers Rob for the info on this. I actually spent a good 20 minutes taking cuts to a purposely small diameter and then removing the boring bar to make measurements just to check all was going well and practicing before I took the final cuts to size without removing the boring bar and trusting in my measuring tool that I made and posted about in the first post. I have to admit, I was concentrating so hard that I have mocked up for the picture below, the bore was actually cut!!
Here is the wooden block:
I actually used this cutter for the wood, the other was too fine a point and was ripping the wood rather than cutting it. Cutting the bore was also good practice!
So here is the mock up - as you can see my bar was 0.625" so only needed a small projection of the cutter. It was nice and sharp and the cast just powdered off.
Bore all nicely cut and final cylinder ready!
Well this method took a lot of effort and many hours of extra work in making the necessary tools but I`m really pleased with how it turned out and certainly another method under my belt for future. Good finish as well! Bore is bang on 0.875 perhaps touching 0.876" - certainly good enough for me and I hope good enough to run!
Thanks to everyone who suggested methods of cutting the bore and gave me advice in any way.
Chris
Rob.Wilson:
Nice going Chris :thumbup: :clap: :clap: :clap:
the bore looks great :thumbup: and you now have a boring bar , setting tool and boring table all ready for next time :med: :)
Rob
ieezitin:
Chris.
Nice job. This will give a few new people a few ideas on how to solve a problem. This is the beauty of our machining hobby so many ways to skin a cat and all have pluses and minuses, a job well done now scrub your lathe clean son get rid of all that organic matter.
All the best Anthony.
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