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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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#1
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Extending lathe spindle
I was thinking with sadness about my Clausing lathe.
It is a totally great lathe, but 4-5 inches near the chuck are very worn and result in 0.008" taper of test pieces that I machined. I thought, perhaps, that I could use an L0 plate, and a 6" round piece of something (like a cast tube or aluminum tube) to extend the plate, and then to put on a plain back chuck. /|~~~~~~~~|===\ ======== | tube | \ ======== | |chuk/ spindle \|________|===/ ^ L0 plate "chuck" misspelled as "chuk" to fit the word in Has anyone ever considered doung so. |
#2
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Extending lathe spindle
On Dec 27, 5:26*pm, Ignoramus27446 ignoramus27...@NOSPAM.
27446.invalid wrote: I was thinking with sadness about my Clausing lathe. It is a totally great lathe, but 4-5 inches near the chuck are very worn and result in 0.008" taper of test pieces that I machined. ... Has anyone ever considered doung so. I bought a scrapped lathe's headstock to temporarily clamp onto the ways further down where the leadscrew isn't worn, or to block up for larger diameters. jsw |
#3
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Extending lathe spindle
"Jim Wilkins" wrote in message ... I bought a scrapped lathe's headstock to temporarily clamp onto the ways further down where the leadscrew isn't worn, or to block up for larger diameters. jsw Jim, I was thinking around the same lines. Can one simply relocate the headstock futher down the bed? Ivan Vegvary |
#4
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Extending lathe spindle
On 2009-12-28, Ivan Vegvary wrote:
"Jim Wilkins" wrote in message ... I bought a scrapped lathe's headstock to temporarily clamp onto the ways further down where the leadscrew isn't worn, or to block up for larger diameters. jsw Jim, I was thinking around the same lines. Can one simply relocate the headstock futher down the bed? It depends on the design of the lathe. My Clausing (Model 5418 -- 12x24") has the motor and countershaft in the pedestal below the headstock, and there are notches cut in the ways to clear the belts going down from the spindle to the countershaft. This would not accept moving the headstock along the bed, and there is a taper pin to lock the position of the headstock on the bed. But -- if your lathe has a motor and countershaft hinged off the back of the bed, that is a different matter -- and your only worry would probably be deflection of the ways with no support feet under the headstock. Some of the Clausings of the same basic model -- but made for bench mounting -- are powered in just that way. Enjoy, DoN. -- Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#5
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Extending lathe spindle
"Ignoramus27446" wrote in message ... I was thinking with sadness about my Clausing lathe. It is a totally great lathe, but 4-5 inches near the chuck are very worn and result in 0.008" taper of test pieces that I machined. I thought, perhaps, that I could use an L0 plate, and a 6" round piece of something (like a cast tube or aluminum tube) to extend the plate, and then to put on a plain back chuck. /|~~~~~~~~|===\ ======== | tube | \ ======== | |chuk/ spindle \|________|===/ ^ L0 plate "chuck" misspelled as "chuk" to fit the word in Has anyone ever considered doung so. Extending the spindle will yield a machine that has no rigidity. Chatter will be a constant problem. Harold |
#6
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Extending lathe spindle
I see, but if the wear is DOWN not sideways, shouldn't these numbers
still apply? I'd think you could test this thinking by clamping an 8 or 10 inch long flat plate to the back of some machined bed surface and then putting a dial indicator on your longest boring bar to test for sideways movement of the saddle as you traverse the bad area. If the saddle is moving sideways, then I see the problem. Wait a minute. Mount a known cylindrical bar in the lathe. Make it as long as you can. Run all the way along it with a dial indicator. If the worn ways ARE the problem, then you should have NO taper at the tailstock end. The tapering should only start when the left edge of the saddle gets to the wear area. If this is true, I am wrong and will never bother you again on this issue. Pete Stanaitis ---------------- Pete, the saddle rides on "inverted vee ways", and the inclining parts of the vees are worn. I can see and feel that wear. i |
#7
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Extending lathe spindle
"spaco" wrote in message .. . I see, but if the wear is DOWN not sideways, shouldn't these numbers still apply? I'd think you could test this thinking by clamping an 8 actually the math works the other way. A little loose up/down lets the carriage slide way back. IMHO extending the chuck will cause more problems than it solves. Karl |
#8
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Extending lathe spindle
On 2009-12-28, spaco wrote:
I see, but if the wear is DOWN not sideways, shouldn't these numbers still apply? The wear is on the vees and it lets the carriage move sideways. I have some other possibilities that I am considering. i I'd think you could test this thinking by clamping an 8 or 10 inch long flat plate to the back of some machined bed surface and then putting a dial indicator on your longest boring bar to test for sideways movement of the saddle as you traverse the bad area. If the saddle is moving sideways, then I see the problem. Wait a minute. Mount a known cylindrical bar in the lathe. Make it as long as you can. Run all the way along it with a dial indicator. If the worn ways ARE the problem, then you should have NO taper at the tailstock end. The tapering should only start when the left edge of the saddle gets to the wear area. If this is true, I am wrong and will never bother you again on this issue. Pete Stanaitis ---------------- Pete, the saddle rides on "inverted vee ways", and the inclining parts of the vees are worn. I can see and feel that wear. i |
#9
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Extending lathe spindle
On Dec 28, 11:48*am, Ignoramus4115
wrote: On 2009-12-28, spaco wrote: I see, but if the wear is DOWN not sideways, shouldn't these numbers still apply? The wear is on the vees and it lets the carriage move sideways. So, the wear is on one side only of the vees? Gravity will keep the carriage centered if both sides are worn equally. Pete, the saddle rides on "inverted vee ways", and the inclining parts of the vees are worn. I can see and feel that wear. You can 'see and feel' microinches of surface finish, too. It would be best to measure the wear and do the calculation before doing an expensive rebuild. |
#10
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Extending lathe spindle
On Mon, 28 Dec 2009 13:48:56 -0600, Ignoramus4115
wrote: The wear is on the vees and it lets the carriage move sideways. I have some other possibilities that I am considering. Long term fix is to save up the pennies and have the bed re-ground. In the meantime, practice scraping to the point where you have no qualms about scraping the carriage and tailstock to fit the re-ground bed. Short term fix. Live with it. Extending the mandrel will introduce you to a world of pain that you don't need. Mark Rand RTFM |
#11
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Extending lathe spindle
On Dec 28, 11:48*am, Ignoramus4115
wrote: On 2009-12-28, spaco wrote: I see, but if the wear is DOWN not sideways, shouldn't these numbers still apply? The wear is on the vees and it lets the carriage move sideways. I have some other possibilities that I am considering. To get .008 runout, the ways would have to deviate from a straightedge enough to get a feeler gage in the gap. Test for that. The 'other possibilities' should include misalignment of the spindle (it isn't aimed accurately parallel to the ways). |
#12
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Extending lathe spindle
On Dec 30, 3:25*pm, whit3rd wrote:
On Dec 28, 11:48*am, Ignoramus4115 .... To get .008 runout, the ways would have to deviate from a straightedge enough to get a feeler gage in the gap. * Test for that. The 'other possibilities' should include misalignment of the spindle (it isn't aimed accurately parallel to the ways). You did support the test bar with the tailstock, right??? jsw |
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