cylinder honing where to buy

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mic

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hi

live in australia and its difficult to get some things here, trying to locate a good cylinder hone for small bores 3/4" to 1 1/2 or there abouts any suggestions welcome. have looked at ammco but start to big

mic
 
I support Swifty with this. I have used brake hones with success and if you get the right one it comes with some finer grit stones for the final finish. One technique that I have recently used on a small bore is a split wooden lap that uses a wedge to spread it. You use valve grinding paste and it is done in the lathe.
Have a look at the myford boy website in the video describing the building of his stove stirling fan. http://myfordboy.blogspot.co.uk/p/blog-page_27.html.
Cheers,
Kerry from OZ
 
Ill go against the grain here. Brake cylinder hones are not a great solution at all. If possible try and locate a set of wrist pin hones, they keep the bore much straighter...
 
The proper type of hone for cylinder bore work is a rigid hone. It will provide a straight bore with the proper dia. and finish. When I was building my Hodgson 9 cy radial, I knew from experience that a brake cylinder hone was marginal at best and a true PIA to use. So I bit the bullet and bought a Sunnen P-180 portable hone. Like all quality tools, the price was high; I paid about US$500 for the complete kit including a Mitutoyo dial bore gage. I expect to recover at least 50% of my investment on eBay after my engine building itch has been scratched.

Anyway, after a bit of practice and experimentation with the set up, I was able to finish all cylinders to ±.0003" over the full length and with the proper cross-hatch finish for fast break-in. And it didn't take all day to do a cylinder. I bored them to .002" under on the lathe and honed them to size in the vertical mill. I think it took about 30 min. per cylinder after I got the hang of it.

Sunnen is not the only brand of rigid hone but is probably the most widely used. Sunnen is available in Aus:

Watson Specialised Tooling Pty. Ltd.
43 Wyandra Street
P.O. Box 2039
Fortitude Valley
Brisbane, Queensland 4006
Australia

Don T. Watson, Industrial Sales Director Ken Watson
Tele:61-7-3-252-4976
Fax:61-7-3-252-3934

Website: www.watsontooling.com.au

WOBhttp://www.sunnen.com/IntRepContact...tor Ken+Watson&[email protected]
 
hi

thank you all for info, did try brake cyl hones but found not quite true enough consistently, sunen i shied at price and missed the p180 size but will get a quote and go that way as much as the price will hurt i like the accuracy and true bore first.

mic
 
hi

will go sunen, your Hodgson 9 cy radial was that the one i saw at minitech a few years ago. was impressed with the quality

mic
 
hi

will go sunen, your Hodgson 9 cy radial was that the one i saw at minitech a few years ago. was impressed with the quality

mic

No, I just finished mine a few months ago and have never shown it to the public. Probably never will.

WOB
 
A brass cylinder lap is a better tool, as it will maintain bore size, unlike a spring hone which with short cylinders leads to a barrel shape. You can make one as well. They are size specific, but can be turned down very easily.
 
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hi

talked with the sunen man and found that it is ratio of length of stones to bore length that is a major part of true bore. i can hone a v4 howell bore reasonable with brake hone but a atkinson diferential cylinder is 5" long
this is where i had bad experience with brake hones. so if i get a quality 3 prong hone with several length stones and grades it will should be ok with care for light running model engines. the sunen is $500 plus $140 for each mandrel and there is a lot of mandrels to do 3/4 to 1 1/4 diameters.

mic
 
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