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Thread: Kopp variator
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2nd March 2013, 06:34 PM #1
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Kopp variator
Hi
Just wondering if there is a web page on these e.g, the theory of operation of the balls and the cones. These devices were used on some machinery before the electronic VFD era . The advantage of the mechanical version, is apparently, no loss of torque with revs change . ...Mike
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2nd March 2013, 08:12 PM #2
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U tube
Found this but I cannot watch it til Monday
tmax how variator works - YouTube
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2nd March 2013, 08:38 PM #3
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no loss of "power" with rev change.
Originally Posted by morrisman
cant help with your question though sorry
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3rd March 2013, 02:39 PM #4
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PDW has had the Kopp out of his colchester. Don't ask how i know.....maybe he may shed some light on the workings?
1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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3rd March 2013, 08:27 PM #5
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Maybe the attached docs on Kopp variator construction and maintenance will assist.
Cheers,
Bill
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3rd March 2013, 09:46 PM #6
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Thank you
Originally Posted by WCD
Ta Bill .
That's what I need . If my " Chippy" is ever going to work like new again
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3rd March 2013, 10:56 PM #7
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I could say the same. My Chippy is in bits for a total check over, clean, replacement of seals etc and possibly a bed regrind. The variator really ought to be checked as well, but the whole project is currently on hold while more pressing things happen. Originally Posted by morrisman
Bill
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4th March 2013, 07:14 PM #8
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They are a PITA. Mine suffers from stiction at times and if you run it down to say 350 rpm in high range there is bugger-all torque. Run it up to 300 rpm in low range and it's noisy - liveable though; I hear they sound like a bunch of rocks in a cement mixer when they're really on the way out.
I have had mine apart, balls & races looked perfect, no visible wear, doesn't make horrible noises, definitely works but I still don't like it. I changed the oil in mine, new gaskets etc, slight improvement but....
Frankly given the modern VFD's I'd dump the Kopp variator, fit a 2 speed intermediate layshaft and a 5 HP 3 phase motor. The trouble with the VFD's is you're not going to get the 10:1 speed range you get with the variator so aiming for 5:1 and a 2 speed layshaft means you have to change a belt occasionally but still have good performance over the speed range. Same reason for going from the 3HP motor to a 5HP, up the available torque at low Hz. There's plenty of room inside the casing once you scrap the variator.
Got a pile of pictures of the interior of mine somewhere but as I only have dialup net access ATM I won't be posting any unless there's a bit you really, really need to see.
PDW
