BlueTR3A-5EKT Posted January 3, 2023 Report Share Posted January 3, 2023 Turning ‘Oilite’ I have a project that requires truncating ‘Oilite’ material on the lathe. I need to consistently reduce an overall length to an accurate size on a quantity of flanged bushes. and no the correct size is only available to special order with moq of 1000. Has any one any practical experience of doing this? My research finds. **GT inserts, they are so sharp and cut cleanly, the "chips" come away and do not smear. Use as sharp a tool as possible Problem is, I was expecting to use an HSS parting tool for speed and limited cuts. Perhaps If I go the VCGT route I will get similar results. NB The wall thickness to cut is only 1/8” (3.2mm) I am expecting a floor to floor time of 2 minutes including de burr, and measurement. The collet to hold is already made. Ideally I do not want to use cutting fluid/coolant as that adds the process of cleaning and re oiling the bushes. (Completely degrease, Soak in SAE30 oil at 80 c and allow to cool) Cheers Peter W Quote Link to post Share on other sites
RobH Posted January 3, 2023 Report Share Posted January 3, 2023 Looks like you found the model engineer website Peter. Have you seen this? : http://www.lm-tarbell.com/machining_sintered_bronze.htm I've never done it but just a thought - the material isn't very strong even for clamping in a collet, are you going to have a spigot to support the bore? Quote Link to post Share on other sites
BlueTR3A-5EKT Posted January 3, 2023 Author Report Share Posted January 3, 2023 (edited) 13 minutes ago, RobH said: Looks like you found the model engineer website Peter. Have you seen this? : http://www.lm-tarbell.com/machining_sintered_bronze.htm I've never done it but just a thought - the material isn't very strong even for clamping in a collet, are you going to have a spigot to support the bore? Thank you. Yes Model Engineering sites are a positive mine of info. Sadly there is a lot of “Yes, I need to do that too” or. “I use brass cutting tools with zero rake but have never machined ‘Oilite’ “. If you want a game try machining Phosphor bronze! Like cheese some grades, like stellite others. The common hassle is the hard skin, like raw cast iron has, peppered with bits of foundry sand. Not to mention it’s desire to jam tools in holes if drilling or reaming. IM Tarbell - They are a company I am aware of but have not asked for the specific bushing to be made. They do not list the length of bush I need, only one correct in all dimensions but length. The longer one is the one I can truncate. I have made an internal bore holding collet from silver steel bar. It spreads and grips the bush id by tightening an internal, long tapered screw. A bit like this which did another bush job. Edited January 3, 2023 by BlueTR3A-5EKT Quote Link to post Share on other sites
ed_h Posted January 3, 2023 Report Share Posted January 3, 2023 (edited) I'm not sure a cutoff tool would be the best choice, but don't know why a very sharp HSS tool wouldn't be as good or better than carbide. I wonder if one of those inexpensive USB microscopes could be used to check the before/after surface porosity? Ed Edited January 3, 2023 by ed_h Quote Link to post Share on other sites
RobH Posted January 3, 2023 Report Share Posted January 3, 2023 If it is a sleeve bearing which is just being shortened, the cut end is probably of no importance for porosity. Different if you were cutting the actual bearing surface though. Quote Link to post Share on other sites
ed_h Posted January 4, 2023 Report Share Posted January 4, 2023 (edited) 2 hours ago, RobH said: If it is a sleeve bearing which is just being shortened, the cut end is probably of no importance for porosity. Different if you were cutting the actual bearing surface though. I understood they were flanged bushes and he was reducing thickness of the flange. Ed Edited January 4, 2023 by ed_h Quote Link to post Share on other sites
Lebro Posted January 4, 2023 Report Share Posted January 4, 2023 Don't think so, just the parallel part : NB The wall thickness to cut is only 1/8” (3.2mm) Bob Quote Link to post Share on other sites
BlueTR3A-5EKT Posted January 4, 2023 Author Report Share Posted January 4, 2023 Correct. Just reducing the parallel tube part’s length not touching the flange. Quote Link to post Share on other sites
ed_h Posted January 4, 2023 Report Share Posted January 4, 2023 Oh, so if you are just shortening the non-flanged end, it wouldn't be a bearing surface, right? If so, i don't see a problem using any kind of tool. Ed Quote Link to post Share on other sites
RogerH Posted January 4, 2023 Report Share Posted January 4, 2023 Hacksaw + file. Any HSS sharp tool Just do it. Roger Quote Link to post Share on other sites
Motorsport Mickey Posted January 4, 2023 Report Share Posted January 4, 2023 + 1 muscle power rocks ! Mick Richards Quote Link to post Share on other sites
BlueTR3A-5EKT Posted January 4, 2023 Author Report Share Posted January 4, 2023 (edited) The HSS parting blade went dull after a couple of bushes and needed re stoning. The TCT tool worked a treat after 2 hours of turning. It is still sharp but I have ordered a new box of tips for next time. First batch finished and all within tolerance of plus 0 minus 0.005” Hacksaw and file would work but a lot of hit and miss to get dimensions to drawing. Single lathe cut followed by de burring gives exactly correct and repeatable results. 100% measurement done. Does anyone need any Oilite washers? Edited January 4, 2023 by BlueTR3A-5EKT Quote Link to post Share on other sites
Adam Blackaby Posted January 4, 2023 Report Share Posted January 4, 2023 Peter, they look very nice, but (excuse my ignorance in advance) , I've forgotten the appication? Adam Quote Link to post Share on other sites
BlueTR3A-5EKT Posted January 4, 2023 Author Report Share Posted January 4, 2023 34 minutes ago, Adam Blackaby said: Peter, they look very nice, but (excuse my ignorance in advance) , I've forgotten the appication? Adam You are the same boat as me then. I do not know their application. The customer sent me a drawing, sample and free issue components to modify. Quote Link to post Share on other sites
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