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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Gear wear on my lathe
Some day I'll figure out how email works..
---------------- Thanks for much detail, Scott. I thought cone-pinion was a pretty strange name for the gear. I'm talking to a guy named Chris, who goes pretty much by the drawing and asking questions of someone else. I'll check into this further. The twins have differing numbers of teeth, 28 on the right, 32 on the left. It looks likely this can be seen in the part numbers. Much appreciated, Steve Scott S. Logan wrote: On Thu, 06 Oct 2005 19:28:24 -0400, Steve Smith wrote: I clearly need to replace some gears on my lathe, the question is how many? There are four gears showing signs of wear, one of them really bad. Replacing all four gets pretty expensive. The lathe is a 14 1/2" Southbend. First, naming the gears. Here's a picture of the group: http://users.frii.com/sos/Steve/Overall.jpg Parts Works names them as follows: top gear in picture (this gear is on the spindle): "cone-pinion" two gears just below cone-pinion: "twin gears" gear which right twin gear drives (below R twin gear): "reverse gear" Usually, I would not contradict Rose, but at least one of the names is incorrect. According to the SB manual, the upper gear in your pic is the Spindle Gear (PT30F2). The Cone Pinion is a different part, located partially within the Cone Pulley (hence the name). The "Twin Gears" are called that in the manual, although we call those the Reverse Idler Gears. For your lathe, they are PT27K32F2 and PT27K28F2. 'Course, if they are "twins", why different numbers? The Reverse Gear is PT28F2. As mentioned elsewhere, these may last a long time yet, but might also fail during a critical operation tomorrow. I agree that the Twin Gear needs replacement at least. I don't know if you can swap them as mentioned by DoN, since they have different part numbers, but if so, that may prolong the life. I respectfully disagree with Harold, that if they fail, they will not do other damage. I've seen it happen in Logan Lathes, and the tooth that gets kicked out CAN wedge into another gear damaging it and even the shaft or stud upon which it is mounted. Of course, if you leave the Reverse Bracket in neutral, there is no load at all on any of these gears, and they SHOULD last forever. Kinda tough to thread that way, though. Good luck! |
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