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| Gold Blend. A Coffee Jar Engine........ |
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| Stilldrillin:
Thanks Dick. The delrin was turned full length, plus about 1/8"....... I just oscillated by about 1". Allowing cyl to rotate a little, every few seconds. Then I swapped ends, every couple of minutes, or so. When I made the piston, it was slightly tight, at one end. 5 mins more oscillating got it parallel. :thumbup: No bell mouth, that I noticed...... Thanks Arnold. I would have liked something a little more abrasive. But couldn't find anything else in the kitchen cupboard...... ::) No oil! I regularly dipped my fingers into the reservoir, and applied. The darker stain is drips from the polished brass. Done over a couple of days. (I can't stand for too long at a time). The polish had dried in the saucer, so I added WD40..... Didn't work! Had to use fresh polish...... David D |
| Rob.Wilson:
Way to go David :bugeye: :bow: :bow: :bow: :bow: :bow: :bow: Very interesting build :thumbup: Rob |
| NickG:
Nice work David, perfect fit! Never really done any lapping myself other than wrapping emery around a stick which after being on the forum for a few years now I realise is the wrong way! But I have heard people use tooth paste? Or would that be too abrasive for your needs? Nick |
| CallMeAl:
Interesting engine made with such a variety of materials! Nice! |
| arnoldb:
Ahh - the dried-out Brasso problem then Dave... Plays hell when it dries out while trying to lap something :doh: - just tightens up and things want to freeze up. I think Brasso is water-based - in the dry climate I live it really dries out quickly. I just take the dried powder and mix it with some light/thin sewing machine oil and that works well for running in engines and a bit of lapping :D - like you said, it's slow :doh: - I have used a bit of fine valve-grinding paste for rougher jobs. And I recently got some tubes of diamond paste, to be used in anger at a later date, but keeping in mind that the lap needs to be softer than the workpiece to prevent the diamond embedding in the workpiece. That WD40 stuff is more solvent than oil - so it ends up evaporating and leaving just the near-dry paste again :doh: - I think that's why I get more fun from the light oil. :beer:, Arnold |
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