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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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Rotary table binding.
Have an old palmgren table:
http://gallery.intlwaters.com/displa...lbum=323&pos=0 It binds up when I clamp something to it using the "T" slots and finger clamps. It's better if I don't tighten the clamps much. Apart from the obvious is there any way to keep the top from warping? Terry |
#2
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Rotary table binding.
On Sep 2, 5:28 pm, "Terry Keeley" tkee(no wrote:
Have an old palmgren table: http://gallery.intlwaters.com/displa...lbum=323&pos=0 It binds up when I clamp something to it using the "T" slots and finger clamps. It's better if I don't tighten the clamps much. Apart from the obvious is there any way to keep the top from warping? Terry Hi, Terry. I am surprised at the table warping enough to cause problems. Have you determined how much clamp force it takes to notice the binding? I was going to suggest you check for a cracked table, but the unit in the picture looks so clean, you could easily spot a crack. However, just to be sure, see if you can gather some iron/steel filings and use them and a big magnet to see if you can spot any cracks in the "T" slots. How recently have you disassembled the table to clean it? Another possibility is the lock is hanging up. I have a very used rotary table that has a broken outer corner of one "T" slot and I didn't do it, so I know that sometimes they get over torqued! Let us know what you find. Best regards, Paul in Central Oregon |
#3
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Rotary table binding.
Thanks for the reply.
I would say it starts to bind at about half the torque I would put on a clamp that was used on the main table, I'd definately like to tighten it some more as I had a piece move on me tonight. I've just taken it completely apart and cleaned, inspected and re-assembled it, it's in great shape... Hi, Terry. I am surprised at the table warping enough to cause problems. Have you determined how much clamp force it takes to notice the binding? I was going to suggest you check for a cracked table, but the unit in the picture looks so clean, you could easily spot a crack. However, just to be sure, see if you can gather some iron/steel filings and use them and a big magnet to see if you can spot any cracks in the "T" slots. How recently have you disassembled the table to clean it? Another possibility is the lock is hanging up. I have a very used rotary table that has a broken outer corner of one "T" slot and I didn't do it, so I know that sometimes they get over torqued! Let us know what you find. Best regards, Paul in Central Oregon |
#4
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Rotary table binding.
On Sep 3, 12:02 am, "Terry Keeley" tkee(no wrote:
.... I see a very clean Clausing mill in there too. Do you have an original drawbar and if so, what does the top end look like? Mine came with a long hex-head bolt and no cap at the top. I made a screw-on cap to pop the drawbar loose rather than hammer on it and the bearings. jw |
#5
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Rotary table binding.
Ya, that was a restoration I did a few years back, love the mill!
I ordered an original draw bar from them, has a champhered nut that tightens against the top of the spindle and another that's pinned so you can thread it into whatever needs to be held. You still have to hammer on it to realease it... "Jim Wilkins" wrote in message oups.com... On Sep 3, 12:02 am, "Terry Keeley" tkee(no wrote: ... I see a very clean Clausing mill in there too. Do you have an original drawbar and if so, what does the top end look like? Mine came with a long hex-head bolt and no cap at the top. I made a screw-on cap to pop the drawbar loose rather than hammer on it and the bearings. jw |
#6
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Rotary table binding.
"Terry Keeley" tkee(no wrote in message ... Thanks for the reply. I would say it starts to bind at about half the torque I would put on a clamp that was used on the main table, I'd definately like to tighten it some more as I had a piece move on me tonight. I've just taken it completely apart and cleaned, inspected and re-assembled it, it's in great shape... Hi, Terry. I am surprised at the table warping enough to cause problems. Have you determined how much clamp force it takes to notice the binding? I was going to suggest you check for a cracked table, but the unit in the picture looks so clean, you could easily spot a crack. However, just to be sure, see if you can gather some iron/steel filings and use them and a big magnet to see if you can spot any cracks in the "T" slots. How recently have you disassembled the table to clean it? Another possibility is the lock is hanging up. I have a very used rotary table that has a broken outer corner of one "T" slot and I didn't do it, so I know that sometimes they get over torqued! Let us know what you find. Best regards, Paul in Central Oregon I am certainly no expert on this but I would look carefully at the clamping geometry. Perhaps use some shims/spacers and try to get the pull-up and push-down forces as close together as possible or otherwise minimize the warping forces. Don Young |
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