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7th February 2013, 10:38 PM #16GOLD MEMBER
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I don't suppose the 4 jaw is big enough to hold the angle plate? Maybe with some of the jaws reversed?
Pete
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7th February 2013, 11:03 PM #17GOLD MEMBER
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No Pete, the 8" 4 jaw is too small to hold the angle plate.
Phil,
My "clamping kit" only consists of a pair of H&F stepped spacer blocks and hold-down clamps with 8mm bolts. I don't know if they would be beefy enough to secure the angle-plate to the faceplate. I might grab another pair next time I'm in H&F.
pipeclay,
The crankcase is very small (32x32x18) and I only need to bore a 12mm hole in it. All work to date on this part has been done with the lathe running at 270RPM. The catch plate might be an option, although I would rather drill holes in the angle-plate or a home-made jig.
Lots of options to consider. Thanks for all the responses.
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7th February 2013, 11:15 PM #18GOLD MEMBER
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Still dont see whats wrong with my spacer idea........ but if you dont like that, how about using your angle plate to make a custom angle plate out of a piece of angle iron?Then you can drill holes where you like.
Stuart
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7th February 2013, 11:20 PM #19Intermediate Member
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How about ...
Why not mount the angle-plate/job to your cross slide and drill/bore from your headstock?
mav
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8th February 2013, 07:23 AM #20GOLD MEMBER
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Stuart,
Nothing wrong with the spacer idea. It may yet come to that. Only trouble is, it would still leave me with an essentially useless angle-plate. I was hoping to rectify that before tackling this job. The custom angle-plate idea is similar to what Bruce did with his square tube. If I do end up making a disposable angle-plate/jig for this job, I will use my milling attachment to square it up. I like this idea because it solves the balance issue too.
Mav,
that's not really an option with my setup. When I eventually get a extended cross-slide with T-slots that would work. I don't have a boring head either, and it has to be bored to a sliding fit with the cylinder liner which is already made.
Chris
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8th February 2013, 08:13 AM #21GOLD MEMBER
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I think the suggestion of a spacer between the faceplate and angle plate is a good one. A 1 inch plate of any material, bolted to the faceplate through counterbored holes, and studs or bolts in the faceplate holding the angle plate allowing it to be adjusted, gives you everything you need. Once made you have it for other jobs down the road too. It's what I would do since the easier option of holding it in the 4 jaw is not possible.
Pete
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8th February 2013, 09:14 AM #22GOLD MEMBER
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If you have the smallest Angle plate that is listed on the H&F website you will be able to use your 8" 4 jaw,I just went and measured mine and there is plenty of room.
Is there any reason why you don't just mount the piece in the 4 jaw.
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8th February 2013, 11:06 AM #23.
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Just for interest's sake.
Photos of Hercus angle plates and a 260 faceplate. The large angle plate is too unwieldy. The smaller probably would have done the job. The 260 plate offers different clamping opportunities to those of the 9 " plate.
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8th February 2013, 04:29 PM #24Senior Member
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Reckon a bolt through the angle plate in one of the slots either side of centre and then a 25mm clamp bar across the angle plate to the outer slots of the face plate should fix it.
counter weight as required.
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8th February 2013, 04:33 PM #25GOLD MEMBER
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Faceplate and angle-plate won't play together
Thanks Bob,
I see the Hercus angle plate has 3 vertical slots. The H&F one has 4 slots, so there is no centre slot to line up with the radial slots in the faceplate. I think the H&F plate is made for a milling machine.
Chris
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8th February 2013, 04:45 PM #26GOLD MEMBER
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Faceplate and angle-plate won't play together
Clubman,
I'm not home right now, but I think with the angle plate where I need it the outer slots wouldn't be useable for bolting a clamping bar.
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8th February 2013, 04:47 PM #27GOLD MEMBER
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Have you got the smallest angle plate hare and forbes have listed.
Could be wrong but I have never come across a dedicated angle plate for lathe face plates.
You do have an 8" chuck or was that a mistake.
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8th February 2013, 11:12 PM #28GOLD MEMBER
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Faceplate and angle-plate won't play together
Ron Chernich recommends the method I am attempting to use. I don't know if the 4 jaw would work, but since he is a model engine making guru and this is my first engine, I'm inclined to follow his advice.
I'm pretty sure I got the smallest angle plate H&F stocks, but I will see if it will mount in the 4 jaw tomorrow.
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9th February 2013, 03:59 PM #29GOLD MEMBER
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It was a mistake. I have a 6" 4-jaw chuck. I always thought it was 8". Sorry for the confusion.
I solved the problem of angle-plate adjustment by drilling two 10mm holes in the faceplate. However that didn't really help with this job. It's impossible (for me at least) to centre the workpiece. As soon as I tap the plate to align it in one axis it moves out of alignment in the other. It's just a tail chase.
So I have milled up a small mounting block from a piece of ali that I will secure in the 4-jaw. If necessary I will shim it to make it parallel to the lathe's axis.
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9th February 2013, 05:49 PM #30SENIOR MEMBER
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Faceplate and angle-plate won't play together
Sounds like you need a wobbler. I will take sone pics of the one I made tomorrow (have to go out tonight). They are invaluable when setting up on a faceplate or 4 jaw chuck.
Phil
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