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6" rotary table  Rate Topic 
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 Posted: Sun Dec 27th, 2009 11:46 am
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daveb
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Mana: 
Hi all, I purchased the 6" rotary table and while cleaning it up yesterday I found a problem.  When cranking, It is very smooth going clockwise, but counterclockwise is smooth but extremely hard to turn.  Am I missing something.  I am new to machining and there were no instructions with the table.  Thanks for any help you can give me.

Dave Barker

Bow NH

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 Posted: Sun Dec 27th, 2009 08:57 pm
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Dongizmo
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Hi Dave,
Welcome to the forum!
Check how the feed wheel disengage works, IIRC, it "cams" in CCW to engage the ring gear on the table, it might be caming in to far if it is not locked, causing it to bind a bit. I will see if I can dig up some drawings in the morning and post them.
Don  



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 Posted: Mon Dec 28th, 2009 09:21 am
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Dongizmo
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Here's one....
Note #2, "Turn handle clockwise at all times"....
Don

Attachment: spec2.JPG (Downloaded 17 times)



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 Posted: Mon Dec 28th, 2009 12:01 pm
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daveb
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Hi Don

Thanks for the quick reply.  First, I gave you the wrong info.  I had no problem turning counter-clockwise and had the problem turning clockwise.  Since your reply I was playing around with the locking mechanizm (2) and I don't understand how that works.  I can see that the feed wheel is on a cam but have know Idea why.  When I picked the table up in your Ma store the fellow took apart the feed wheel locking mechanizm and there were two clamping pieces(?) that came out.  we had a job to get them back in right and now I wonder if we did get them back together the right way.  I have a suspicion that these could be causing the problem/  Another question comes up on only turning the table in one direction.  Is this standard on a rotary table.

Thanks

Dave Barker  Bow NH

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 Posted: Mon Dec 28th, 2009 01:56 pm
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Dongizmo
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The fine feed is on a cam so you can disengage it and turn the table by hand, the locks for this should just be opposing "wedges" drawn together with a screw to clamp down on the outside of the cam/bushing that the worm gear shaft fine feed wheel run through.
I don't see any reason for it to be run in only 1 direction either, it is a very simple machine, and it could be as simple as it might push the worm gear and shaft out of position.
Here is a exploded view from one of our vendors.

Attachment: MAYURDrawing(RotaryTable-6in).jpg (Downloaded 16 times)



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 Posted: Mon Dec 28th, 2009 01:59 pm
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Dongizmo
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Here is another vendors

Attachment: page-01.jpg (Downloaded 16 times)



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 Posted: Mon Dec 28th, 2009 04:43 pm
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daveb
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Hi Don

The diagrams really helped me understand how the table works.  I took the taper lock apart to check on the postion of the wedges.  The wedges looked ok but could they be gripping the worm shaft when tightened up causing the hard turning?    When I disengage the worm shaft using the cam feature both the table and the worm shaft turn very well.  When I engage the cam and tighten the taper lock is when the turning of the crank gets tough.  I also noticed that when cranking, it seems to go through a cycle of easy turning and hard turning every 5 or 6 turns of the crank.  Any help will be appreciated.

Dave

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 Posted: Mon Dec 28th, 2009 04:51 pm
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Dongizmo
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Dave,
Try to find the "sweet spot" in the cam position where you are at the best gear engagement.
I have noticed considerable improvement by disassembling, cleaning, and reassembling useing a quality lube (I used Superlube grease, only because I had it on hand).



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 Posted: Mon Dec 28th, 2009 06:35 pm
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daveb
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Hi Don

I think I have found the problem.  The degree ring around the crank handle is not formed very well.  It is rubbing up against the cam housing and causing the problem.  I took the crank handle off and was able to turn the worm shaft with ease in both directions just using the shaft.  I do need the angle ring and will see if it just needs to filed down on the edge facing the cam housing.  Hopefully this is all it will take.  Thanks for the help.

Dave

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