adam
Member
Posts: 3
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Post by adam on Feb 22, 2007 14:06:09 GMT
I want to bush a cylinder which is 125mm long. I propose to drill the existing ovalled hole oversize and fit bronze bushes at each end. How do I set up the piece on my Myford lathe to drill as centrally as
possible. I have a vertical slide etc. I also have a pillar drill if this is considered preferable.
Any advice gratefully received.
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Post by Jo on Feb 22, 2007 14:23:21 GMT
Hi Adam,
I would bore the cylinder not drill it. What shape/size is this cylinder? 125mm seems big. Ideally you should be mounting it on a face plate but if it's too big you may be mounting on the saddle......
A dial gauge will enable you to centralise the bore or if you don't have one: a boring bar in the tool holder. If you clamp the work up in what seems to be the correct position and you manually rotate the work you will quickly see which side is off centre and can correct the position of the work.
Jo
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Myford Matt
Statesman
There are two ways to run a railway, the Great Western way, and the wrong way.
Posts: 621
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Post by Myford Matt on Feb 22, 2007 15:39:54 GMT
Wow, that's some cylinder.
Jo's advice is quite correct, but pics would help. (Sign up to Photobucket and link to them - quite straight forward.)
MM
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John Lee
Part of the e-furniture
Posts: 375
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Post by John Lee on Feb 22, 2007 19:00:21 GMT
I would slightly disagree with jo about mounting on a faceplate, if it really is 125mm long you will never get it parallel using a more than 125mm long boring tool within the capacity of a Myford, it would need to be massive to be stiff enough.
It would need to go on the saddle, with a between centres boring bar of quite long length. As Matt says some pictures would be good for more help. Firstly what sort of cylinder is ?? A cylinder from an engine of some sort or just something errrr cylindrical??
John
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adam
Member
Posts: 3
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Post by adam on Feb 23, 2007 7:08:23 GMT
Thank you Jo, Matt and John. Hope I am replying in the right box, I am a bit new to this  Having removed the part, which is off a 1934 Frazer Nash car, I find that I have misled you! It is one of two parts and this is only 50mm long with a half inch shaft. It has a bell crank attached as it is part of the gear selector system and so cannot be mounted on the face plate. John was right with the "errrr cylindrical"! It's not going to be easy to hold still, but not impossible. I guess I can mount it on a shaft in the chuck and then pack it onto the saddle and proceed gently whilst praying hard. |
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John Lee
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Post by John Lee on Feb 23, 2007 7:26:16 GMT
I still havn't quite got a picture in my mind of what this is...  But if you want to hold a cylindrical object (it it?) still on your crosslide use a v block and pack under that until the bore is at centre height. Don't clamp the whole thing down too hard, or when you release it your nice new round bores will be a bit oval perhaps, it depends how substantial this is. Nice car by the way, is that the chain drive one?; my brother does this with a similar aged Riley, albeit it was rather souped up in the 50's into a special with a Jaguar engine..... ;D. I get the bits to fix..... John |
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Post by ron on Feb 23, 2007 11:27:59 GMT
Adam I think you would get more help if you took Matt's advice and posted a pic, I can't really figure out what you want to do either.
Ron
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Post by steammadman on Feb 24, 2007 20:35:50 GMT
Adam, Best advice to you would be for you to look up your local "Model Engineers Society",
make contact with them, or one of them,pay a visit, you will be surprised at the amount of help and advice tou will get, and maybe , some new freinds.
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Post by Tel on Feb 24, 2007 21:19:50 GMT
Why can't you just hold it in the chuck and use a single end boring bar?? Thank you Jo, Matt and John. Hope I am replying in the right box, I am a bit new to this Having removed the part, which is off a 1934 Frazer Nash car, I find that I have misled you! It is one of two parts and this is only 50mm long with a half inch shaft. It has a bell crank attached as it is part of the gear selector system and so cannot be mounted on the face plate. John was right with the "errrr cylindrical"! It's not going to be easy to hold still, but not impossible. I guess I can mount it on a shaft in the chuck and then pack it onto the saddle and proceed gently whilst praying hard. |
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Post by chris vine on Feb 25, 2007 11:19:00 GMT
Hi Adam,
I am wondering if you might be able to true up the hole with an expanding reamer, quite expensive new, but someone here or on the Ads part of the site might have an old one for sale.
This way you might just open up the holes until you have taken out the wear and then fit an oversize shaft....
Just a thought
Chris.
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gugger
Active Member
Posts: 47
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Post by gugger on Feb 25, 2007 19:29:56 GMT
Hello Chris,
Your not on the way yet to Switzerland to reduce the amount of scrap in your body ?
Regards
Walter
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Post by chris vine on Feb 25, 2007 19:39:27 GMT
Ha Ha Gugger,
Yes flying out tomorrow morning, then there will be one less piece of stainless steel in my knee and a bigger scrap pile in Sion on Tuesday!! Teach me to be more careful in the future.
These Doctors make us model engineers look Clumsy by comparison.
Chris.
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adam
Member
Posts: 3
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Post by adam on Feb 27, 2007 7:32:11 GMT
Hi everybody, delighted to say job done. Not exactly perfect precision but it works. I packed it on the crosslide and used an end mill to bore as best as I could. I couldn't use v blocks or put it in the chuck as there are chunks of steel welded to it. I will sort out photogaphy for the next crisis as when you don't know what you are talking about it is difficult to describe what you want to achieve. Thanks for all your help, I am a hooked lurker and who knows one day. . . . .
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John Lee
Part of the e-furniture
Posts: 375
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Post by John Lee on Feb 27, 2007 19:35:13 GMT
Well done Adam, glad you got it sorted; I hope to see your car on the road again. We can challenge you to a reversing contest ;D Myself and bro are doing a Yorkshire Bank sponsored John o' Groats to Lands End in the Riley Special, lots of spares following behind. Probably will p*** it down all the way  Regards, John |
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Having removed the part, which is off a 1934 Frazer Nash car, I find that I have misled you! It is one of two parts and this is only 50mm long with a half inch shaft. It has a bell crank attached as it is part of the gear selector system and so cannot be mounted on the face plate. John was right with the "errrr cylindrical"! It's not going to be easy to hold still, but not impossible. I guess I can mount it on a shaft in the chuck and then pack it onto the saddle and proceed gently whilst praying hard.
