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| Maiwald Makeover....... |
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| Stilldrillin:
Thanks Nick. So, I made one........ It reminded me of compressed, dried leafmold....... Couldn't polish it to round. It went all shapes, like a piece of grainy softwood. :scratch: And, the engine would only run, when persuaded with a small blowlamp. :bang: Think I'll make a brass piston, if I can get the time, tomorrow. :thumbup: David D |
| NickG:
Nightmare! :doh: Well at least you've tried it, looks like I got lucky with the piece that was donated, it was much finer, more like the stuff you seen on motor brushes. Looks like brass might be the way forward for you then, I just struggle with the whole lapping / getting a perfect fit thing though! Nick |
| andyf:
m-machine are advertising a new plastic with a great fanfare. They say it works OK for piston rings; I wonder if it would be stable enough for a complete piston. It's on this page: http://www.m-machine-metals.co.uk/mm/website/metals_menu.html Andy |
| philf:
--- Quote from: andyf on October 16, 2012, 02:13:28 PM ---m-machine are advertising a new plastic with a great fanfare. They say it works OK for piston rings; I wonder if it would be stable enough for a complete piston. It's on this page: http://www.m-machine-metals.co.uk/mm/website/metals_menu.html Andy --- End quote --- Looks an interesting and useful material. At £8.37/ inch of 25mm diameter it's not cheap. To quote from a data sheet: Main characteristics: high max. allowable service temperature in air (continuously 260°C) excellent chemical and hydrolysis resistance good wear resistance low coefficient of friction very good dimensional stability good electrical insulating properties oustanding UV and weather resistance inherent low flammability FLUOROSINT® 500 (PTFE + mica) (ivory) FLUOROSINT® 500 has nine times greater resistance to deformation under load than unfilled PTFE (tested according to ASTM D 621; stress of 14 MPa of 50°C). Its coefficient of linear thermal expansion approaches the expansion rate of aluminium and is 1/5 that of virgin PTFE. It is considerably harder than virgin PTFE, has better wear characteristics and maintains low frictional properties. FLUOROSINT® 500 is also nonabrasive to most mating materials. . Phil. |
| Stilldrillin:
Nick. I probably should have spent more, on a better quality piece of graphite...... Andy. I think that will do the job! But, at the price Phil's come up with, it might be some while before someone tests it....... :palm: Well...... I made a brass piston. It looks much better than the compost one! :thumbup: It even runs much better......... All parts are just bodged together....... It wasn't really happy, but I left it running for some 10mins or so. Stopped it. And realised, the clonk was the piston hitting the bottom of the cylinder! 1mm removed, tomorrow, should make all the difference. Ready for finish build, now...... :) Happy little Drillin! David D |
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