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- เผยแพร่เมื่อ 3 ต.ค. 2024
- A guide through an experience of rebuilding a worn out Atlas/Craftsman quick change gearbox. When we are done, it will last twice as long as before. All these gearbox's from the various models are the same from an evaluation, tear-down and rebuild perspective. Most parts are interchangeable with only a few differences in shaft length and case mounting.
Check out my Bushcraft, Camping, Maker and Machining content. I enjoy knife and ax making, leather work, metal work, machining, Blacksmith and general do it yourself projects. I am an individualist who see's mankind in the light of his highest positive potential.
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Join me as I craft my own home Knife and machine shop. My goal is to improve self sufficiency in all homesteading, survival and maker skills. You can do it also. I believe in getting my hands dirty and getting it done. I like Clausing, Craftsman, Atlas, South Bend and Logan equipment. Follow my journey as I learn what I know and what I don't know. We might even talk a little philosophy here and there.
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That's a great tip using the magnet on a screwdriver when removing a circlip.
1st View, 1st Like, 1st Comment. HA
Why is this lathe "desert tan"?
I have a early 12" Atlas Craftsman Lathe and I'm trying to identify when it was made. The tag says S. N. 12L 038144. Hopping you can help.
Hey Dave, I have the 12” atlas I’m missing some of the transmission gears could you give me some advise on how to locate them
This is my wife’s I pad my name is Hank not dana
There are people who part these out on Ebay. It is possible to make them on your lathe. It is also possible to order blanks from Boston gear and machine to thickness, add keyway etc... Try searching on Ebay the following: "Quick Change Gearbox Atlas Craftsman". Then reorder the results low to high. I doubt you'll see any as cheap as $10. Expect most of them to be in the low to mid $20's. Pick up what you can and watch it every week for more. I do not have any extras to sell or I would offer them to you.
Hey I'm just curious Dave I'm not sure if that's your name I can't remember now dang it but anyways I just got a Craftsman lathe and it's decently big the bed is about 48 in Long and it has a four jaw Chuck on it right now that's about 8 in diameter and it's got a three jaw Chuck that's about almost 12 in in diameter maybe 10 in reality but it's got a quick change gearbox on it and the lead screw looks pretty dang Sharp not beat up at all the ways on the bed look pretty flat I'm not really sure what else to look for other than chips and the teeth and the gearing and all that stuff it came with all the belts and it came with some gigantic reamers that I don't know what to do with really they're massive they're like 1 in up to 2 in od and some of them are left and then some of them are right. Anyways I'm just curious if you could help me out and identifying them with like what I need to do to this machine or what I need to look at in order to start it out I've never owned a late for I mean I tried finding parts for this goodell-Pratt metal lathe?! But seriously!! ....all I needed was a flipping compound cross slide for it....I had a shot at (one!) on eBay in the 2 years I've had it. And of course! It was the only one I saw, or found. Flipping thing sold for almost 300. Figures. Those old G.P. lathes we're like the first of they're kind 1898 or 189 whatever the build year was. I'm pretty sure I'm selling it now we'll obviously. It doesn't even have a lead screw so no threading just well I'm not sure now if it's a metal lathe now.. they both looked identical the wood ones and metal from G.P. anyways I I purchased a south bend 9" lathe great shape but it came with a riding mower transmission for the
"quick change gearbox" no kidding. Pretty genius actually, he just mounted a flat belt pulley onto the output shaft. And I'm about to put some drill press vari-speed pulleys onto the shafts that have single pulleys right now. It's 3 jaw chuck is great it's about 4 or 5 inches in diameter perfect for what I'm trying to do. What I'm asking is...stupid question coming up. Are the quick changes interchangeable? Lol probably not next question! Lol can I put a smaller chuck onto this craftsman lathes headstock spindle? Like the 5" or 6" I have on my South bend? Can I thread that SB. Chuck onto the Sears roebuck lathe spindle? ? I'm so sorry for this ridiculous comment I truly apologize sir
Those change gears are zamak aren't they? They will melt at about 700*F if they are, also, it might been better to file down the wear or groove on that shaft then drove it out.
Inside the Quick Change gearbox they are all steel. I know, surprising. I own all the QC versions they made (as far as I am aware) and they are all steel. I couldn't get to most edges but some would be possible. I've got 2 more to do. ;-) The shafts are soft and I suspect the gears are hard so it is unlikely I would broach a keyed gear. I should check the hardness to be certain however. You'll see in part 2 that I do file an edge trying to ease the removal of the output gear. Incidentally, I'm not reusing any bushings.
Question,,, do all quick change gearboxes have a clutch,,, mine don't have the protruding clutch you can adjust but if I have to much pressure treading it will slip out,,is there an internal clutch on all of them??
George, good to see you. ;-) The Atlas Quick Change lathes do not have clutches except for the "Commercial" 12" version. I own 2 of those. One is tore down for restoration (I'm embarassed to tell how long!). I've thought of replicating the clutch or buying used parts to add that feature to my main 10" Atlas. I have not looked to see if there is room or if it's actually possible. It might be you'd need the Commercial QC gearbox to accomplish it. My main method has been to refuse any interuptions when I am working with power feed. Let me be specific for all readers here. By clutch I don't mean an engagement clutch as some larger lathes have in the apron. But rather a safety clutch between the lead screw and QC gearbox which will slip in case of a carriage crash. The lathes without safety clutches use a potato chip thin bearing block at the other end of the lead screw which is supposed to break when you crash the lathe. The lead screw bearing block supports all thrust loads of power feed. I've not crashed a lathe before. From speaking with others and reading others comments, there are usually other things that break like gears and change gear couplers. I think the best idea is to use a plastic change gear coupler someplace in the drive train to create a weakest link in case the operator were to screw up and crash the lathe.
@@CraftedChannel so your saying I must have the commercial gear box,,, and the break out clutch is inside the box itself?
My mane issue is I don’t know the description of the gears on the gear selector , it’s the 2 on the same shaft as the selector
The two gears (idlers) on the little short shaft in the selector is one problem I am short of tooling for. I need to remake a pair of these shafts but need a straight knurling tool of the right pitch to create the spline on them. I've just started collecting knurling wheels. The gears with the big hole in them driven by the shaft are two different pitches. Both of them are 20 teeth. The larger one is 16dp, smaller almost certainly 20dp. I don't have a gauge to measure the smaller one but it's probably published and there are other ways of measuring them. The tricky thing here is they both have a male key way tooth in them as they are driven by the shaft. There are only a couple ways to do this, one is wire EDM, the other is broach the key slot then silver solder in a section of key stock. It might also be possible to leave the little section of key floating as it would be held in position by the inside edges of the bushings in the selector. If I tried the floating key, I'd probably make the key longer than the gear width by about 3/8" and notch it back so it was down in the slot under the bushing for about 3/16" on each side. Polish and radius the ends so the selector can slide easily. You'd want to notch it back enough that it could never touch the bearing surface. I'm thinking a simpler shorter key could be more likely to bind in lateral re-positioning. Like all things, there are options. You can also purchase pinion stock to make these out of. It's about $90 from McMaster to get a foot each of pinion stock. If somebody is listing the gears, they will be cheaper than buying material. If you can't find them, I would make them for you if you purchased the pinion stock and sent them to me. 6847K47 and 6847K22 respectively. My pay would be the leftover material. And, be warned, it might take me a while, I have a busy life.
admit yards snaked me on first post
wow auto spell sorry lol
Do you believe it is possible to do a homemade version of the gearbox for a homemade lathe ? I'm currently building my own from scratch and scraps .
Yes, there is a video on YT where a guy is doing it. I think it's from an old Popular Mechanics write up or something similar. It wouldn't do it however. See channel Clough42. He's designed and electronic lead screw drive. Threading, feeds, everything.
@@CraftedChannelthanks !!!!!