Enco lathe repair

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A while back I purchased an older Enco lathe 12X36 model 92010.This is a Taiwanese built one from 1984. This poor thing has been pretty badly treated in the past and I want to bring it back to usable life.One of the needs I have is concerning the lower gears. Some of the teeth on the lower gearing assembly have been sheared off. This usually occurs when some dummie runs the tool post into the chuck.......I have been told to braze on new metal and then take file to create the new teeth. I have had good success with building shafts etc up with my mig. But I lack a mill to re-cut the gear teeth.Of course parts for this are no longer available. The other Jet, Grizzly, etc. ones have different sizes of shafts so I can't adapt one of those.I am looking for suggestions.Thanks.Glenn. Attached ImagesSign on East Texas payphone: Calls to God 40 cents......it's a local call...
Reply:I would.take that to a local machine shop with an indexing head and a broach or other type of cutter.
Reply:Maybe, you could find two gears with the same pitch diameter through McMaster-Carr or MSC and simply bore the centers out of them to make a ring, then turn the teeth off the original gear and simply slip the ring over and tack weld in a few places (or braze if its cast).  Maybe use a little interference in the fit for extra strength.If you can find an outfit that specializes in making gears, their prices should be pretty reasonable to have new ones made.  The least gears I had made were done by an outfit in Texas.  They ran $1500 a piece but they were large gears, over a foot in diameter and 6 inches wide.  Something your size might run $150 a piece?
Reply:attach a chain to it throw it over board now you have a boat anchor    an enco  12x36 lathe costs approx  $ 2500. new its not worth it
Reply:Originally Posted by ed lattach a chain to it throw it over board now you have a boat anchor    an enco  12x36 lathe costs approx  $ 2500. new its not worth it
Reply:Thats just the  back gearing for extra slow turning.   Its usable as it is.    If you dont plan on doing any   threading   I wouldnt work on it.   If you need a low gear for  threading  you can do what an old shop I worked in did with a similar circumstance.  THey  used a gear motor on  rocking tensioner plate.    It connected by a loose  belt to the   lathes original motor from a pulled bolted on the shaft.    To slow it down we just turned it on and shut the lathe motor off and it  was used to turn.  threads.
Reply:Hey Glenn,Take it apart & send the gear to Zapster...... he'd fix it. You could also check with HGR Industrial Surplus as they have tons of parts for all kinds of equipment.DennyComplete Welding/Machine/Fab. ShopMobile UnitFinally retired*Moderator*"A man's word is his honor...without honor there is nothing.""Words are like bullets.... Once they leave your muzzle, you cannot get them back."
Reply:I have the same problem with the old Enco I bought almost 2 years ago.  Only mine is missing the back gear, shaft and all related parts.  The details escape me now but I was given the name of a shop near Dallas that makes gears for what I was told was a reasonable price.The current replacement for mine shares many of the same parts but the backgear and main gears have a different tooth count for some reason. Last edited by duaneb55; 09-04-2011 at 09:24 PM.MM200 w/Spoolmatic 1Syncrowave 180SDBobcat 225G Plus - LP/NGMUTT Suitcase WirefeederWC-1S/Spoolmatic 1HF-251D-1PakMaster 100XL '68 Red Face Code #6633 projectStar Jet 21-110Save Second Base!
Reply:Duplicate post.MM200 w/Spoolmatic 1Syncrowave 180SDBobcat 225G Plus - LP/NGMUTT Suitcase WirefeederWC-1S/Spoolmatic 1HF-251D-1PakMaster 100XL '68 Red Face Code #6633 projectStar Jet 21-110Save Second Base!
Reply:I have seen older American-made lathes with missing gear teeth repaired by drilling and tapping holes where the missing parts of the teeth were, say three holes per tooth, then screwing in steel machine screws and shaping them in the profile of the gear teeth, such that the three screws together in a row replace the missing tooth.  They don't have to be exactly adjacent to each other, but separated by a 16th or so.  The screw diameter is exactly the width of the base of the gear teeth or a little wider, and they are cut to the gear tooth profile with files.  Those teeth individually don't have an excessive amount of stress placed on them, especially while threading, unless, like you said, somebody leaves the wrench in the chuck.  I have seen a number of older lathe gears repaired that way.  Enough to make me think it might have been a common practice.  You might check some of the posts on practicalmachinist.com.Looking again at your pics, though, those gears are missing an awful lot of teeth and many that are still there are in bad shape.  Probably worth the price to get a new gear.  Tried checking for the manufacturer online?  I'd be surprised if you can't order replacement parts.  Many of those Asian lathes were duplicated by many manufacturers in Taiwan, China, Korea, Thailand, etc.  I can't imagine you wouldn't be able to find the right part somewhere.Last edited by thenrie; 09-08-2011 at 01:23 PM.TonyMiller Maxtron 300Miller Spoolmatic 3Victor Journeyman II"Twern't my ignorance done me in, but what I knowed that wasn't so."  Uncle Tom's Cabin
Reply:Thanks for all the replies guys.......First off, can use it as a boat anchor.....damn thing floats!!I tried to get the bull gear(front right one) from Jet. They got rid of all their older parts a couple of years ago. Then tried Grizzly for some other gears. They now come from China. The Chinese changed the sizes fo the shafts a few thou which makes it a real pain. You either have to drill out the gear or turn the shaft down in size.The Chinese bull gear from Grizzly is $107 last year and I'm not sure that the gamble that it will be close is worth the money.It turns out the back gear only has four teeth missing so fixing it won't be as bad......Denny, I think you may be right. A PM to Zap may be in order. I'm not in a hurry right now for this as I have other work to do on this first. I do need the threading capability but that won't be for a while yet.Duane, I had the name of that place in Houston some place as well. Just can't find it again. Do you have the original pulley on the motor? It's a dual pulley and I need to know the sizes. Someone put a single pulley on my motor.The ranch is a low budget operation so even though it's in kind of rough shape, the time spent and what it can do for the investment makes it worthwhile until I can save up and replace it with a South Bend or Clausing down the road.GlennSign on East Texas payphone: Calls to God 40 cents......it's a local call...
Reply:Here's a picture from practicalmachinist.com that shows a gear repaired the way I mentioned above.  See the small gear on the lower right with several repaired teeth. Attached ImagesTonyMiller Maxtron 300Miller Spoolmatic 3Victor Journeyman II"Twern't my ignorance done me in, but what I knowed that wasn't so."  Uncle Tom's Cabin
Reply:Thanks for posting this picture. That's a really neat technique.It turns out the back gear (small one on the right) is only missing four teeth. I think it is a candidate for the repair you mentioned.The front right gear is going to be a test. The jury is still out on that one.Do you know of specific postings in Practical Machinist on the gear repair principle?Cheers.GlennSign on East Texas payphone: Calls to God 40 cents......it's a local call...
Reply:I remember reading one with some pictures, but I couldn't find it when I searched last week.  I seem to recall it was in their forum on antique machines, but I'm not sure.  It's pretty simple, though.  Like I said, they just drilled holes, tapped them, put in the screws (loctite), then filed to shape.  I would think it isn't difficult.  I'd just mark the screw positions with a center punch and drill the hole with a drill press. Might have to file out the remains of the broken tooth before drilling.Search gear repair, or tooth repair, or something along those lines in the practicalmachinist forums and you should find something.  There is another forum, called hobbymachinist, or something like that, where you might find something as well.TonyMiller Maxtron 300Miller Spoolmatic 3Victor Journeyman II"Twern't my ignorance done me in, but what I knowed that wasn't so."  Uncle Tom's Cabin
Reply:I have done it on my old LeBlonde lathe..I brazed over the screws once they were screwed in and filed to fit...still working fine