I love billet

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It's a good thing life isn't a race. I'd still be at the starting line!


...Wait...it's not, right?
 
comnoz said:
My mill is just a Bridgport series 1 with an Anilam 3300Mk control. I have added a stepper 4th axis and a stepper for rigid tapping. It will do about anything but clean up it's own mess. You can't hurry it -it's not rigid enough to do anything very fast. I wish mine were larger. Jim
Click to expand...

Ha! We always want a larger one :D The problem is it's a point of diminishing returns. A bigger more rigid machine will let you cut faster and if rigid enough let you do hard steel, but then how often do we need that? That Series 1 is a good machine. I had one with ball screws in my old shop that I never got around to putting motors on because I used it manually too much. I really want a bench top CNC for making my own parts...something like this:

http://www.boltonhardware.com/category/ ... c-mill.php

Pretty decent price for a new machine.
 
Seems like a better option than casting aluminium barrels. I looked at casting a set a while back however had doubts about sleeves. Always wonder that the bit that hangs below the barrels might split. As I said, I'd feel more comfortable if the sleeves were high strength steel and very thin. 70s TZ Yamahas had chrome plated bores, however I don't know what the rings were made of. The combination has to be right.
 
How about a web cam so we could watch? It would be better than anything on tv. Thinking you could start a show on building motorcycle parts, would be worlds better than any of those other motorcycle shows.
 
Hortons Norton said:
How about a web cam so we could watch? It would be better than anything on tv. Thinking you could start a show on building motorcycle parts, would be worlds better than any of those other motorcycle shows.
Click to expand...

Via web by subscription! I would sign up!
 
acotrel said:
Seems like a better option than casting aluminium barrels. I looked at casting a set a while back however had doubts about sleeves. Always wonder that the bit that hangs below the barrels might split. As I said, I'd feel more comfortable if the sleeves were high strength steel and very thin. 70s TZ Yamahas had chrome plated bores, however I don't know what the rings were made of. The combination has to be right.
Click to expand...

Steel is a pretty poor surface for piston ring sealing.
Ni-resist is much better for sealing and wear than steel and is around 5 times the tensile strength of gray cast iron. Cracking will not be a problem.
Plus Ni-resist has almost the same expansion rate as aluminum so it does not need to be fit as tight in the barrel and it stays in contact when the barrel is hot. Jim
 
Hortons Norton said:
How about a web cam so we could watch? It would be better than anything on tv. Thinking you could start a show on building motorcycle parts, would be worlds better than any of those other motorcycle shows.
Click to expand...

Naa, Then I would have to comb my hair. Jim
 
Hortons Norton said:
How about a web cam so we could watch? It would be better than anything on tv. Thinking you could start a show on building motorcycle parts, would be worlds better than any of those other motorcycle shows.
Click to expand...
+ 1 the crap on tv doe's my head in at times
 
comnoz said:
acotrel said:
Seems like a better option than casting aluminium barrels. I looked at casting a set a while back however had doubts about sleeves. Always wonder that the bit that hangs below the barrels might split. As I said, I'd feel more comfortable if the sleeves were high strength steel and very thin. 70s TZ Yamahas had chrome plated bores, however I don't know what the rings were made of. The combination has to be right.
Click to expand...

Steel is a pretty poor surface for piston ring sealing.
Ni-resist is much better for sealing and wear than steel and is around 5 times the tensile strength of gray cast iron. Cracking will not be a problem.
Plus Ni-resist has almost the same expansion rate as aluminum so it does not need to be fit as tight in the barrel and it stays in contact when the barrel is hot. Jim
Click to expand...

Can you buy it as centrifugally cast tube ?
 
dennisgb said:
Jim,

How are you going to clamp that to do the other side?

Dennis
Click to expand...

I will bolt it to a jig using the head bolt holes. The jig will need to tilt to the angle of the lifter bores. Jim
 
acotrel said:
comnoz said:
acotrel said:
Seems like a better option than casting aluminium barrels. I looked at casting a set a while back however had doubts about sleeves. Always wonder that the bit that hangs below the barrels might split. As I said, I'd feel more comfortable if the sleeves were high strength steel and very thin. 70s TZ Yamahas had chrome plated bores, however I don't know what the rings were made of. The combination has to be right.
Click to expand...

Steel is a pretty poor surface for piston ring sealing.
Ni-resist is much better for sealing and wear than steel and is around 5 times the tensile strength of gray cast iron. Cracking will not be a problem.
Plus Ni-resist has almost the same expansion rate as aluminum so it does not need to be fit as tight in the barrel and it stays in contact when the barrel is hot. Jim
Click to expand...

Can you buy it as centrifugally cast tube ?
Click to expand...

No, that is the hard part. Only bar stock. Jim
 
comnoz said:
I will bolt it to a jig using the head bolt holes. The jig will need to tilt to the angle of the lifter bores. Jim
Click to expand...

Should have thought of that...
 
Can you buy it as centrifugally cast tube ?[/quote]

No, that is the hard part. Only bar stock. Jim[/quote]

Years ago, we had to sleeve a seized 250 Yamaha MX bike one weekend and used a cast iron sewer pipe to make the sleeve. It finished the race as I remember.
Jaydee
 
jaydee75 said:
Can you buy it as centrifugally cast tube ?
Click to expand...

No, that is the hard part. Only bar stock. Jim[/quote]

Years ago, we had to sleeve a seized 250 Yamaha MX bike one weekend and used a cast iron sewer pipe to make the sleeve. It finished the race as I remember.
Jaydee[/quote]

That would work fine, it would be gray cast iron. It could be a little more porous since sewer pipe isn't likely to be spun cast. Jim
 
comnoz said:
jaydee75 said:
Can you buy it as centrifugally cast tube ?
Click to expand...

No, that is the hard part. Only bar stock. Jim
Click to expand...

Years ago, we had to sleeve a seized 250 Yamaha MX bike one weekend and used a cast iron sewer pipe to make the sleeve. It finished the race as I remember.
Jaydee[/quote]

That would work fine, it would be gray cast iron. It could be a little more porous since sewer pipe isn't likely to be spun cast. Jim[/quote]

I understand sewer pipe is what Burt Munroe used for his cylinders :)
 
jaydee75 said:
Can you buy it as centrifugally cast tube ?
Click to expand...

No, that is the hard part. Only bar stock. Jim[/quote]

Years ago, we had to sleeve a seized 250 Yamaha MX bike one weekend and used a cast iron sewer pipe to make the sleeve. It finished the race as I remember.
Jaydee[/quote]

There are three common grades of cast iron - grey cast iron (fairly weak ) , Meehanite when calcium has been added to precipitate calcium silicide (fairly strong), and cast iron with nickel content - you can make gears out of it - Ni-resist is one of those. I've made drum brake liners out of centrifugally cast Meehanite, it is as hard as hell. I've never used Ni-resist.
 
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