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shaft and bushing for the B/C change gears
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I was doing some general turning under power feed yesterday, nothing elaborate, and all of a sudden the lathe stalled. After much investigation I finally diagnosed the problem: the B/C gear bushing has somehow fused or stuck itself to the B/C gear shaft on which it rides. Seems absolutely welded. Right now I have it soaking in wd40.
Anyone had a similar problem and can give any advice? Thanks, Paul |
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Jerry Durand
polish shaft and use more lithium grease?
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On 10/09/2011 09:17 AM, jaspercan7 wrote:
I was doing some general turning under power feed yesterday, nothing elaborate, and all of a sudden the lathe stalled. After much investigation I finally diagnosed the problem: the B/C gear bushing has somehow fused or stuck itself to the B/C gear shaft on which it rides. Seems absolutely welded. Right now I have it soaking in wd40. --
Jerry Durand, Durand Interstellar, Inc. www.interstellar.com tel: +1 408 356-3886, USA toll free: 1 866 356-3886 Skype: jerrydurand |
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I should be more specific. In addition to suggestions to keep it from happening again, are there any recommendations for non-destructive ways of separating the stuck bushing from the shaft?
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--- In 7x12minilathe@..., Jerry Durand <jdurand@...> wrote:
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Ian Newman
--- On Sun, 9/10/11, jaspercan7 wrote:
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开云体育?Replacement is only $3.84 from . ?I'd say to just think of the replacement part? as a kind of reverse Murpy's Law: If it no longer matters whether or not you can get the old bushing off without mangling it all up, it will of course come off with no real drama. Only if there is no replacement easily available does Murphy's Law apply.? Similar to the "butter-side-down" rule for dropping your toast or the fact that it is exceedingly rare for your car to conveniently break down right in your driveway, or perhaps in front of your favorite local garage. ?When mine seized up I used two flat screwdrivers to force it off, then I lightly round filed the ends to clean up the prying marks, and wetsanded the shaft down a bit until it was a sliding fit again. Since then I have made a point of using lots of white lithium there ever since. This is exception to the mostly true opinion from those you may have read about here who have decided those plastic gears need no lubricant... except for that metal on metal bushing you discovered, that too is only mostly true... :-) ?Good Luck! ?John Z. Of York, Pa. On 10/9/2011 12:47 PM, jaspercan7 wrote: ? |
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开云体育Happened to me too! Didn’t make sure it was oiled often enough I guess.
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Don’t fuss with it too much! You can get news one from Little Machine Shop
for just a few bucks.
for? $3.84
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for $ 5.94
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Of course, you could make these yourself if you had a working
machine........
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Bob
? From: jaspercan7
Sent: Sunday, October 09, 2011 9:17 AM
Subject: [7x12minilathe] shaft and bushing for the B/C change
gears ?
?
I was doing some general turning under power feed yesterday, nothing
elaborate, and all of a sudden the lathe stalled. After much investigation I
finally diagnosed the problem: the B/C gear bushing has somehow fused or stuck
itself to the B/C gear shaft on which it rides. Seems absolutely welded. Right
now I have it soaking in wd40. |
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I had the same problem a few months ago. I had to use a drifter to get
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things apart. I cleaned up the parts and gave them the shaft a polish as it was scored. It looks like a lubrication problem so I tried white lithium grease on that shaft. I am interested to see if others also experienced this problem. I also cleaned my gears as I had greased them up when I go the machine which was a mistake. As most are nylon/plastic they don't need grease which the swarf sticks to. Cheers, Andrew in Melbourne On Sun, 2011-10-09 at 16:17 +0000, jaspercan7 wrote:
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Hi Paul,
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I've had exactly the same problem. I managed to tap the shaft out of the bush using a brass drift. I cleaned it up and it was usable again. The real problem is that it is a steel shaft running in a steel bush. I made a complete new banjo to Richard Hagenbuch design and used a phodphor bronze shaft. Since then I have not had any problems. Mosre info on the redesigned banjo can be found here: Mike --- In 7x12minilathe@..., "jaspercan7" <jaspercan7@...> wrote:
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First remove the shaft assembly off the lathe. Now we limit the damage
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to the machine. (Don't ask how I learned this!) Place the shaft over a short pipe. I used a PVC cut-off that was 25 or 30 mm long. It was just the right diameter. A few squirts of penetrating oil to give it some lube. Then a drifter was used that fitted to the bottom of the threaded hole and drifted gentle it out. An alternative is to place a suitable bolt in the threaded portion and strike that. I did not have a suitable bolt hence my drifting from the bottom of the hole to protect the thread. The danger is you can break the bottom out of the hole which is bad. A third alternative which I feel might make the situation worse is to have a drifter that fits the 8mm hole of the bush. I avoided this method as I felt if it stated to mushroom the metal of the shaft it would expand onto the bushing or reduce the opening of the threaded portion. Just my 5 cents. Andrew in Melbourne. On Sun, 2011-10-09 at 11:28 -0700, Ian Newman wrote:
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开云体育I have done quite a bit of thread cutting on my
7x14 MicroMark lathe and have not had any problems. Not sure I understand what
part you're talking about. Pictures?
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Chuck in E. TN |
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Thanks to all for the replies. I did indeed get the bushing off using two screwdrivers. I cleaned it up a bit - just enough to keep me working - while i await the arrival of replacement parts. And I will be making a bronze bushing, at least, eventually.j
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--- In 7x12minilathe@..., SirJohnOfYork <steelchipper@...> wrote:
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mattdbartlett
This happened to me once. As I recall, all I did was remove the gear, remove the support pin from the banjo, and drive the pin out (gently). I would recommend putting the screw back in the hole so that it isn't tight, and then tap it gently. Then take a file and some sand paper, and take down all of the rough spots. More grease is a good idea too. Mine hasn't done it again.
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-Matt --- In 7x12minilathe@..., "jaspercan7" <jaspercan7@...> wrote:
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Dave
For bushings, particularly those carrying shafts that rotate at high speeds, I prefer to use Molyslip gearbox additive - straight from the can - rather than grease. This is quite a viscous fluid and seems to remain in place better than grease and a top-up spot or two, applied every year or so, penetrates easily.
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All of my power tools have had this treatment and in over 30 years I have never had any seize or noticed excessive wear. Dave. --- In 7x12minilathe@..., "mattdbartlett" <mattdbartlett@...> wrote:
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In the thread gear train this is the bushing the pair of gears in the center of the 4 gear arrangement mount to and the shaft that bushing runs on. Paul M
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--- In 7x12minilathe@..., "Chuck" <chunk07@...> wrote:
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