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Thread: Machining setup, thoughts needed
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9th Aug 2018, 08:31 AM #1Most Valued Member
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Machining setup, thoughts needed
Hi all
I have a hole that needs machining which contains a shaft with a bevel gear on one end. Needless to say due to the meshing of the gears, some accuracy is required.
Here's the thing, I am struggling to work out how to set it up accurately enough for what I want, though, I may just be overthinking it too much. I don't have much I can use to check the accuracy of the setup on the casting and with what I have come up with, something is just not sitting right in my mind.
I am hoping for some input from the brains trust as to what I am doing wrong or if there is another way. If any more pics are needed please yell out, same with info and answers.
It is a Pickering Governor used to control the speed of a steam engine.
Phil
Pickering speed adj copy.jpg 20180328_152121.jpg Pickering Governor24 copy.jpg Pickering Governor42 copy.jpg Pickering Governor68 copy.jpg Pickering Governor33 copy.jpg
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9th Aug 2018, 08:47 AM #2Most Valued Member
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Is the the existing hole accurately positioned but just worn? If so I might just ream it in place and make a bigger shaft. Otherwise I would probably use the bottom face of the valve base on an angle plate (ideally on a mill but you could put an angle plate on your faceplate.
Sing out if you want to use a mill.
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9th Aug 2018, 09:15 AM #3Most Valued Member
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As Ralph mentioned, I'd set it in the centre of the casting. Because the gears are bevelled, adjustment would be back and forth using shims to remove backlash. As long as it's in line with the vertical shaft, it should be good.
KrynTo grow old is mandatory, growing up is optional.
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9th Aug 2018, 09:35 AM #4Most Valued Member
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9th Aug 2018, 09:37 AM #5Most Valued Member
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9th Aug 2018, 11:13 AM #6
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9th Aug 2018, 11:17 AM #7Most Valued Member
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Very hard sometimes to get a good feel from photos.
Have you got an angle plate that is big enough to mount to the face plate and still allow you to mount the flange to it?
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9th Aug 2018, 08:01 PM #8Philomath in training
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My thoughts are that the bottom flange is square (or should be) square to the bore, so clamp that to an angle plate and that should get the cross bore square to the plate base (whether that's on a face plate or a mill bed. (A horizontal mill could possible do the job without the angle plate).
Getting the cross bore square in the other direction will need a bit of work with an indicator, but if you clamped a piece of plate to your 'good' surface, that would probably give you a good side to side position. That will depend on whether that surface is square to where the bore should be.
Michael
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9th Aug 2018, 09:35 PM #9Most Valued Member
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9th Aug 2018, 09:51 PM #10Most Valued Member
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Hi Michael
I machined the recess on the opposite end to the flange and used that to get the vertical bore in alignment. The thought was that I could use the flange to bolt an outrigger support if needed
getting the cross bore square in the other direction will need a bit of work with an indicator, but if you clamped a piece of plate to your 'good' surface, that would probably give you a good side to side position. That will depend on whether that surface is square to where the bore should be.
Just thinking that a fairly decent fairly straight bit of something, like a lathe bed could give me the same setup as a milling table.
Phil
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9th Aug 2018, 09:55 PM #11Philomath in training
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9th Aug 2018, 11:54 PM #12Most Valued Member
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10th Aug 2018, 10:32 AM #13
Would it be possible after seeing the set up on the face plate to do it on a mill Phill?
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10th Aug 2018, 04:20 PM #14Most Valued Member
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Absolutely Ray, about the only extra problems I could see would be not enough 'Z' because it would certainly take up some space but also requires a boring bar about 3" long.
A head that can be swung 90 deg. would alleviate this problem though.
There is also nothing to dial off to locate the bore under the spindle. The bore I have is well worn so dialling up will only be an approximation, as it will on the lathe, but, I will be able to see it rotating and gauge a lot easier by eye as to its concentricity.
Silk purse out of a sows ear springs to mind, still, it is heritage.
Phil
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10th Aug 2018, 10:15 PM #15Most Valued Member
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Your better bet is probably to put some smooth tape around the outside of the casting and dial in on that.
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