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| Robinson Hot Air Engine. |
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| NickG:
Well done David, now just don't try taking it to bits any further now :lol: You'll definitely sort it once and for all now, just like the builder should of. To be fair, I think he's done a better job on it than I could though! Nick |
| Stilldrillin:
Well, the ascent has started. :thumbup: Some months ago, I bought meself a couple of pieces of cast iron, £1 each, at a flea market. I was thinking flywheels, at the time. :scratch: Looks just the ticket..... Turned a spigot on both ends. Time to bore out...... Largest drill I've got, 16mm...... At knock off. After some time spent boring through at .020" a pass, the hole is now around 1"+. David D |
| shoey51:
doing a grand job there mate keep up the great work :clap: |
| Stilldrillin:
Thanks Graham! :thumbup: Three sessions today..... Had to keep resting the motor, as I could smell hot paint, or summat! ::) This project has made me realise the pifflin' power output of a 7x12. Started off at 20thou passes. Finished, only just managing to pull 10thou, though things were a little hot...... :bugeye: Got the bore roughed, 2.25 (-1/32") Hope the o/d is a little easier. Don't like overloading things! |
| Bluechip:
Dave Oooh Dear .... you might do well to strip that motor :( Is it anything like 600w as per a Chester Conquest (20?) Mill, 'cos someone I know had a stinky motor after being used a lot on one of those, and we just saved it I think. Briefly, he said the motor pongs and it's a bit stiff to turn, but it does turn. Not the mill spindle, 'cos it turns freely in neutral. Not good sez I. You may have got it so hot that it's taken up the end clearance on the armature. Give it a good hour or so to cool, see if it's freed off. No, did not. Will it free with use ? No. Take it off. See whats really happened. Some little black bits fell out, what are they? Dunno. but not normal. Leccy motors never need a de-coke... OK. Strip it. Take the brushes out. Remove the tie bolts. It appears that there is some soft white jollop to take up clearance in the winding slots. This had got hot, melted, and run between the magnets and armature. There to carbonise with friction. So, told him to very carefully remove any white bits that looked out of place, clean out the motor , re-assemble and give it a go. Success. Motor free .. Just tried to phone him, but he's away in Denmark. But his wife says she thinks 'he fixed the motor, and it's still OK' He ??? I spent about 2 hrs on the phone, and sent some 5 e-mails with sketches ... spoon feeding the twerp ... Grrrrrr May not be any relevance to your motor Dave, but ... if it saves one .. Dave BC |
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