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Post by ron on Jul 16, 2007 12:22:37 GMT
Hi Everybody
There is an expression used in M Evans' book on building the Simplex I've never heard before, if someone can enlighten me I'd be obliged.
He's referring to boring the cylinders and says 'for boring the cylinders, use the selfact, with the finest feed available'
I've never heard of a selfact before, does he mean use power feed or does it have some other meaning?
Ron
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Post by baggo on Jul 16, 2007 12:34:22 GMT
Hi Ron,
yes, it just means use a power feed to the saddle. If, like me, you have an ML7 or similar it means using the lead screw with the largest gear ratio that you can get. I rigged up a separate geared motor with a variable speed driving the lead screw handle via a rubber belt. Works a treat and you can get a bore with a glass like finish.
John
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Post by ron on Jul 16, 2007 13:14:53 GMT
Hi John
Thanks, I thought it probably meant that, it's an expression I'd never heard before.
Ron
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Post by Boadicea on Jul 16, 2007 14:47:37 GMT
Boring answer - what the dictionary says  .... self-acting [self-ak-ting] –adjective, acting by itself; automatic.  New for me too. Nice idea for driving the lead screw Baggo. |
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Noddy
Statesman
Posts: 672
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Post by Noddy on Jul 16, 2007 16:53:37 GMT
Try looking up boring in the yellow pages, it says;
See Civil Engineers
They're not far wrong....
Keith
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SteveW
Elder Statesman
Posts: 1,399
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Post by SteveW on Jul 16, 2007 20:39:43 GMT
Ron,
It occurs to add that if you have a non-gear box Myford the standard gear set will give you a thread feed at or around 120tpi tops. This is still a bit coarse for a good finish. However, you can get a little compound gear from Myford (two different ones for 7B/ML7) that goes at the top of the gear set. It cost money but I've found it well worth it for the slower feed it gives.
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