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Post by Deleted on Jan 19, 2018 11:16:00 GMT -5
I've read quite a few posts here over the short time I've been on this forum.I've noticed that as time goes on,finding a new or even a good used cylinder for someone's chainsaw is sometimes next to impossible,especially with the really old saws.In one of the posts I read re-plating the cylinder came up (I'd known about this option for quite some time now).I know people are spending a bunch of their hard earned money on used cylinders,but the re-plating option might not be as expensive as one would think,& when done you basically have a"new"cylinder.Last night I did a little research & contacted a re-plating company in Wisconsin.I sent an email & got a response earlier today,it is as follows: Scott Reath <ScottR@usnicom.com> Today at 9:45 AM To edju1958@yahoo.com Message body Yes of course we have replated and repaired thousands of chainsaw cylinders. However we can only repair the ones with the closed ports (no open vertical transfer ports- those cannot be safely honed. Most of the better quality saw cylinders had closed ports.) So probably a good idea to shoot me a picture prior to sending them to us just so we are sure we can do them. . Cost is $169-$230 apiece depending on how badly damaged they are. Sorry I would not be of any help with the pistons. I have attached our brochure along with a $30 coupon and the work order form. Thanks for your interest in US Chrome! Scott Z Reath, Owner/ G.M. U.S. Chrome Corporation of Wisconsin 650 Oak Park Avenue, Fond du Lac, WI 54935 scottr@usnicom.com www.usnicom.com920-922-5066 x 101 920-922-5069 - fax I know if anyone wants to contact them,they'll most likely send you a $30 coupon as well.
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Post by Deleted on Jan 19, 2018 12:01:39 GMT -5
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Post by onlyhomelites on Jan 19, 2018 15:20:33 GMT -5
However we can only repair the ones with the closed ports (no open vertical transfer ports- those cannot be safely honed. That eliminates most old Homelite cylinders as they are open port. I wonder why honing is unsafe?
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Post by sweepleader on Jan 19, 2018 15:50:56 GMT -5
They probably need special tooling to keep the hones out of the ports.
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Post by jerseyhighlander on Jan 19, 2018 16:06:41 GMT -5
Doubtful it's unsafe per say, but they probably break a lot more hones that way. Makes me wonder what if we did the honing ourselves and sent them a cylinder ready to go? Should also get us a better price on just the plating part too.
Almost makes me wish I was still in the fabrication industry with all the contacts & resources I used to have for this stuff. At times, plating, anodizing & powder coating was just a walk down the street, or a drive on the forklift, with two or three choices nearby too. But then again, I'd have to regularly be in the part of the state that looks like an infestation from the air and glows in the dark at night... No thanks.
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Post by sweepleader on Jan 20, 2018 0:07:47 GMT -5
The chrome lining needs to be honed after plating to hold an oil film.
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Post by onlyhomelites on Jan 20, 2018 8:33:03 GMT -5
Since it had to be honed from the factory originally, I still fail to see why a standard ball hone would be a problem. I'm not a metal worker, but it seems unlikely that the plating was applied before the ports were milled out.
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Post by sweepleader on Jan 20, 2018 11:04:29 GMT -5
Here is my take on honing 2 cycles. I will start with the fact that I have never attempted to hone a 2 cycle cylinder, but many 4 cycle engines have seen my hone. I have worked with metal all my life.
The ports were cast with the rest of the cylinder, not cut later. The cylinder was machined to size, the plating was applied over the existing ports, then the cylinder was honed.
I don't know for certain how they kept the hone out of the ports. I do know that the ball hone had not been invented yet and if it had, the balls would simply shatter banging off the ports in a production setting. I would not recommend a ball hone for any two cycle although I am sure they have been used. I am also sure they would damage the plating at the ends of ports as the balls fell into the port then smacked into the end of the port and jumped back into the cylinder.
A standard spring loaded 3 or 4 stone hone would do the same thing, likely breaking the stones too.
The factory almost certainly used a Sunnen type hone that has "fixed" stones which can be adjusted to a given size while running, they are not spring loaded in the normal sense. These machines were invented in the '40s. It is a big machine and unlikely to be found in a garage workshop. The stones cannot fall into a port. It operates like a horizontal milling machine rather than vertically or portable. The cylinder would be mounted in a fixture and its axis aligned with that of the hone before any machining.
I would guess that the ports could be filled with fingers of steel, properly shaped, to keep spring loaded balls or stones from falling in. The steel would wear down and need to be replaced after a while. The leading edge of the stone would still hit the edge of the port, again possibly damaging the plating.
The object of honing a plated cylinder is not to change the bore size, after all the plating is VERY thin. The object is to put the crosshatch on it to break in the rings and hold an oil film.
It would be very interesting to get real information from someone who actually worked in a 2 cycle factory and knew exactly how it was done. My guess is it is still done the same way on modern engines.
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Post by makowicki on Jan 22, 2018 13:15:38 GMT -5
At work i grind cantilever springs to get custom spring rates we grind within .0005". We use "dolphin epoxy" to grind the springs. These are very thin springs. Once ground to size a little heat allows us to remove the epoxy. If would be posible to make a form or even put mold release on the piston to cast in the epoxy, clean up excess, hone then remove.
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Post by sweepleader on Jan 22, 2018 16:57:11 GMT -5
That sounds like a plan to me.
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Post by rarefish383 on Mar 21, 2018 8:28:18 GMT -5
Not that this helps any, just one of those garage find stories. I was probably still in my early 20's. I think I still had my Dodge 340 powered front engine dragster. I've always been addicted to auctions and estate sales. Riding down the road I saw an "auction today" sign and an arrow. Big estate sale, mostly women buying high end antique furniture. Went out in the garage and there was a Sunnen CK-10 boring and honing machine, and not a motor head in sight, and me with no money to speak of. It sold for $150, Joe.
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