| Gallery, Projects and General > Project Logs |
| Mini Lathe Upgrades |
| << < (8/16) > >> |
| Stilldrillin:
--- Quote from: Brass_Machine on March 12, 2013, 10:14:43 PM --- Can I just solder the leads directly on to the brass pieces? Eric --- End quote --- I'd have a go, Eric! :thumbup: Don't go using too much heat, and loosen the fit in the plastic bell..... :palm: David D |
| RussellT:
--- Quote from: Brass_Machine on March 12, 2013, 10:14:43 PM ---Can I just solder the leads directly on to the brass pieces? --- End quote --- I don't see why not but I'd think about trying to fix the spring too. Ideas that spring to mind are tying the ends together with a small piece of wire or hooking the broken ends together, and then locking with a dab of solder. If the spring is copper you could try winding a new one. If it doesn't work you have lost nothing. Russell |
| andyf:
I don't know the internal diameter of the spring, but maybe you could pass a length of wire into it at the break, round the spring and then out again at the other side of the break. Put the spring on the brush holder, and then twist the ends of the wire together to tighten it up like a tourniquet. If that's impractical, cut the spring off the lead, and in its place solder on a length of copper wire so you have a T shape, bend the arms of the T round the brush holder and twist the free ends together to tighten up. I'm not sure how hot it gets inside these motors, but hard solder rather than soft might be better. Andy |
| PekkaNF:
Usually nothing inside of the good quality heavy duty electic motor is soldered, because they can get very hot. Specially the brushes. They easily exceed soft solder meltting temperature...it's not very ideal to have blop of solder bouncing around commutator and brushes. Another reason is repeated thermal shock, usually grimp joint responds better than a solder. Then again: the end bell looks plastic, maybe that motor should not be run hot? Most usual joint construction is: BRUSH - flat copper braid - then grimp connector or disco connector for lead. http://www.healystool.co.uk/productimage.html?imageid=18624&size=large or this type flying lead and spade (sorry for the lamp): https://www.interlight.biz/itemimages/64382.JPG Is there any good electric motor shop nearby? They should have something to replace and iprove it. You need to specify voltage (has an effect on brush material), motor type and mechanical dimenssions. We have one oldtimer here...he has retired least 15 years ago and still has his shop on a garage. Pekka |
| Brass_Machine:
Fixed the spring issue on lunch today. BTW Thanks Andy for the idea!! The broken spring: I took apart a twist tie for the metal 'string' inside. Then I threaded it into the spring and tightened it up on the post. Yes, I trimmed the tie before I put it together again. |
| Navigation |
| Message Index |
| Next page |
| Previous page |