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Post by miniburrell on Apr 4, 2009 19:40:53 GMT
Hi All
I few days ago i posted about working on my 10V flywheel, it has been recomended that i use a small boring bar to bore the hole for the crank, and not use a drill bit,
Does any one know where i can get a small boring bar to fit a 8mm tool holder and bore my 7mm hole.
Many Thanks
Paul
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Post by keithcat on Apr 4, 2009 20:34:51 GMT
For a hole this small 7mm , I would use a home made boring Bar. Start with some round HSS and set to work. There are quite a few pictures in books for the shape you should be aiming at, but I have been pushing caravan s about all day and too tried to remember off hand any. ( or to speel properyly. I will put a more useful post up tomowwor unless some one else beats me to it.
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SteveW
Elder Statesman
Posts: 1,399
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Post by SteveW on Apr 4, 2009 20:47:09 GMT
Paul,
I money is no object then from Chronos....
New Glanze SWUCR Miniature Boring Tool
Ref: SWUCR
This new Glanze Boring Bar is great for the smallest of jobs. The Minimum boring size is a stunning 5.8mm only. The way the special small inserts are mounted allows boring up to a shoulder as well as allowing internal facing cuts. The shank is 8mm with flats top and bottom. Length is 100mm - Reduced section is 18mm long. CLICK THE IMAGE FOR A LARGER PICTURE
Price inc UK Mainland Carriage : £28.04 (£32.25 Including VAT (european union only) (appl European union only) at 15%)
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Post by Deleted on Apr 4, 2009 21:33:52 GMT
Paul. I built a 10V some years ago to power a 48" boat. I also bought the book on it. I can' t remember if the flywheel had a cored hole in it, but if it is solid, my advice, for what it is worth (and I don't know anything, to follow an earlier thread!) is to centre/drill the flywheel and after you've drilled it either ream it 7mm or make a D-bit to suit. Concentricity to a few thou shouldn't be an issue unless you have a specialised use in mind. If it is cored (i.e. a cast hole in it) you will need to bore it, following earlier advice to make your own bit out of a piece of HSS. Alternatively, I've never been seduced by glamorous insert tools: the one in this picture is a Stellite boring tool bought for £2.00 from the Tracy Tools stand at an ME exhibition. It fits into a 1/4" dia. holder held in the QC toolpost. JB
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