|
Tony Spencer
Can anybody tell me if there is a 0-16.5 group as I haven't been able to
toggle quoted message
Show quoted text
find one? Or in particular Lynton & Barnstaple. Cheers Tony Spencer -----Original Message-----
From: Mark Kendrick [mailto:trainbrain@...] Sent: 17 January 2005 03:43 To: O-14@... Subject: RE: [O-14] Gear trains in loco's Frank, Thanks for relating your experience and the photos. I think I will go for a gunmetal or steel worm with a delrin or celcon gear with a widened bearing area to prevent the wobble. Regards, Mark -----Original Message----- From: Frank Sharp [mailto:Frank.J.Sharp@...] Sent: Thursday, 13 January 2005 11:39 PM To: O-14@... Subject: RE: [O-14] Gear trains in loco's Mark, I assume when you say gear chain you mean a worm and gear and then a set or series of gears to either increase the reduction ratio or move the drive somewhere else. I've always understood that the worm should be harder than the gear, hence steel/brass and brass/nylon. Nylon/nylon seems to work, but if you get anything abrasive in the mesh the worm soon wears away. Think about this if your thinking of sand ballast for example. Once you've got to the gear to gear section, unless you can find helically cut gears, if indeed they are made so small, and unless you can run in an oil or grease bath, metal to metal gears tend to be noisy. My only objection to some of the small nylon gears used in reduction boxes is that rather than rotate with the shaft they are intended to rotate on the shaft. If they are thin they tend to wobble. I've sleeved nylon gears with brass tubing to make the bit which rotates on the shaft slightly longer and a closer fit to stop the wobble. Usually I use brass gears if available in the size I want and put up with the noise. If possible I sleeve the final drive gear on the driven axle. The brass sleeve is stopped from spinning by a piece of thin wire through a hole drilled through the brass/axle/brass so it goes right through. You can then leave the wire out whilst you set up the quartering and any valve gear. I'll put a picture in photos of the drive for my De Winton. The motor goes up in the boiler and this whole unit is sprung. This leaves the real driven axle clear for the working valve gear. Frank O-14 Photos area: O-14 Files area: Yahoo! Groups Links O-14 Photos area: O-14 Files area: Yahoo! Groups Links |
