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Webster IC Engine build log.

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sbwhart:
Chris

You could be running the disc too fast try slowing it down, also try a little drop of tapping fluid on it you know the brown stuff that comes in a squeezey bottle.

crankshafter:
Hi Chris.
Had to jump in on this one, as I'm on the go to try to make my own  gearcutters.

One thing Chris, do you try to cut the same blank in the second attempt, if so the blank could have been workhardened  from the first try. If so you have to aneel the blank, heat red and let it cool slooow.
AAAAAAAAAAAnd rpm. down, aaaaaad plenty cutting-oil.
I'm going for a  :coffee: ,will check in later and look at your finished cutter :)

Have a nice "Shopday".
CS

raynerd:
Well I read all your replies and then went to give it another go. I decided to switch across to the lathe as it was easier to see centre height which was also a concern. I noticed my file was sliding a little off the cutter blank so I heated the blank silver steel to cherry and let it cool for half an hour back down - this seemed to soften it up a bit so maybe it was a little work hardened. Also being on the lathe now, it wasn`t likely to run too fast so I put it on fairly slow speed. I re-ground my cutters and made sure they were sharp. It cut very well, although one side cut better than the other which was a bit annoying, but it did cut. I ended up with this:



I`m going off from John's plans now a little and I`m just using a single point cutter. It is unlikely I`ll use it again and to be honest, I`m cutting ally so it shouldn`t take too much of a bashing. I`m making ally gears, I know that it really is not suited but consider this will run a few times each year at maximum when it is built, I can`t foresee too many problems - thoughts?

So I cut the disk in half and bored it square to the face, hardened and  tempered. Needs a final grind now and sharepen but that is as far as I got:



Now this picture concerns me a little - I think it is the angle that I`ve presented it to the camera but the cutter looks a little bent. It doesn`t look like this in real life so I`m hoping it is an optical illusion. I`m posting the picture anyway, it shows a rough profile of the cutter:



So next job is to finally cut a gear!

Chris

kwackers:
Did you lock the saddle before you fed in the cutter?
Looking at the picture it could be the saddle has moved - you did say one side cut 'better' than the other.

NickG:
Getting there Chris, am impressed - can't understand why it chewed the tool the first time - maybe the blank did get hard as a result of parting etc.

Guess the proof will be in the pudding when you cut the gear - it looks as though it could be an optical illusion though as there is a bigger shadow on one side.
 :thumbup:

Nick

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