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Post by keith1500 on Dec 13, 2010 14:09:38 GMT
Having read the thread on injectors and whether the Linden chamfer makes any difference it dawned on me to have a go.
Now i bet theres many people who like me have an old injector that has been replaced and merely resides in the parts box no longer in use. So, i am thinking theres not a lot of work in making a new set of cones assuming you can make the D bits in the first place !
Any good hints or tips inc photographs etc on making a D bit or other means of forming a nice taper in an injector cone?
Cheers Keith
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Post by baggo on Dec 13, 2010 17:04:23 GMT
Hi Keith, I made my reamers from silver steel with the tapers turned in the lathe by setting the topslide over at the required angle. I then filed away about 1/3 of the thickness and hardened and tempered them. They were then ground down to half thickness with a grinding wheel in the lathe chuck. The reamers were clamped in the tool holder and fed across the grinding wheel, advancing the cut a few thou at a time. You have to be very careful as the reamers are quite flimsy! Also, make sure you get as fine a finish as possible on the reamers, especially the flared one for the entrance to the delivery cone. When I make another set, I will probably leave the reamers dead hard as it's easy to twist them if they are too soft. They cut very well in the brass that I use for the cones but it's a case of cut a bit, withdraw to clean away the swarf, etc. I'd recommend DAG Brown's articles on making injectors for anyone considering making their own. Have fun! John
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Post by keith1500 on Dec 14, 2010 9:01:56 GMT
John,
Thanks for your reply and the photo. This made me recall seeing this from your web and managed to find it again. So I'll restudy your notes and have a go at making the bits. I have been thinking about investing in a set of collets for sometime and this adds to the reasoning!
Cheers Keith
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