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Tractor Talk Discussion Forum

extension of a skaft

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crackerhead

01-12-2007 17:52:29




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needing to extend the mandrel shaft on a sawmill by about 4 feet .Shaft size is 2-3/16 .I can not find a piece of shaft that size .I have a piece of 2 " shaft . what would be the best way of fastening them end to end ? I thought about getting 2 sprockets with the right bore ,welding them to the end of each shaft [they are not keyed ]and wrapping them together with a double roller chain .The new shaft will be supported by a couple of pillow block bearings . Do you think this will work ? I checked on lovejoy couplings but none were big enough Also thought about maybe machining a coupling but was wondering about it running true with each other .What do you guys think or any other suggestions

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gene bender

01-13-2007 08:43:09




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 Re: extension of a skaft in reply to crackerhead, 01-12-2007 17:52:29  
get two #60 chain sprockets one with each dia for the shafts. Now the sprockets have to have the same # of teeth so they are the same outside dia. Then using double #60 chain to connect the two. This coupling will stand lots of power. The outside dia of the sprockets is not important just get enough chain to go around.



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Ol Chief

01-12-2007 20:59:08




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 Re: extension of a skaft in reply to crackerhead, 01-12-2007 17:52:29  
If this was my problem,I would discuss it with a local bearing supply house.In view of your intention to support the extension with two pillar blocks,I would purchase one of them fitted with a double thrust ball or roller bearing set up. Then join the shafts with a flexible coupling.There are any number of mgf.of these available such as made by Falk or Waldren.Any of them should give years of trouble free service.This type coupling usually operates with an air gap between faces. This will do away with possible whip in the shaft extension. If you go this route make sure to drill the pillar blocks thru and into the base plate and install tapered dowel pins once the proper alignment has been established.This will insure against possible shifting and misalignment in service.The bearing and coupling supplier can fit the coupling to shaft and keyways.

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Don L C

01-12-2007 19:23:55




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 Re: extension of a skaft in reply to crackerhead, 01-12-2007 17:52:29  
I would machine a pice of 5" long -- 2" pipe with 1/2" wall.....True up the inside, then cut 3/8" grove, for key.....good idea to get the key stock first.....



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in sticks

01-12-2007 18:13:35




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 Re: extension of a skaft in reply to crackerhead, 01-12-2007 17:52:29  
if? this shaft is going to have the saw mounted on it what you are planning to do sounds a little dangerous.i would not weld the couplings,leads to stress cracks. be careful



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