table drive ass'y?

[shamefowjze]

i have a couple of table drive asseblies that are "slipping whenever the table is in the down motion(cusing it to bounce while it travels) what might be the cause of this. we have the old style table drives and i'd hate to have to shell out the $330 for a bunch of new ones.
thanks


alex

[Lampie]

Re: table drive ass'y?

Maybe this is old news but I put the table drive screw and nut not too tight. I did use to have the same problem. Just put the assy together without too much pressure and give it about six shots of grease every two month, this helps(and ofcourse look if they're not falling in pieces).
But I'm not a table drive guru.
I don't even know why there's hook shaped thing on the left side..... oops sorry I promised not to mention that again.

Martin

[Dutch]

Re: table drive ass'y?

Shame,

You've been around for a while, [img]/content/btubb/images/%%GRAEMLIN_URL%%/wink.gif[/img] so I assume that you've already checked the most common causes of table bouncing:

Table drive assy being loose on the drive shaft (usually accompanied by a worn key and/or keyway).
Worn drive shaft splines (where it goes into the gearbox).
Worn gears inside the gearbox.
Table drive assy hitting the frame bolts as it goes around.

Exactly what is slipping? Which cycle… spot, respot or both?

Dutch

[Jimmy Jam]

Re: table drive ass'y?

Yep, bolts to tight like the guru said or the spacer is missing between the bearings on the rod end. But then again like Dutch says, every time I make a service call for a bouncing table it ends up being a loose drive on the shaft.

[shamefowjze]

Re: table drive ass'y?

thanks for the ego boost dutch [img]/content/btubb/images/%%GRAEMLIN_URL%%/laugh.gif[/img] . what happens is this. machine starts cyle as the table goes down the table starts to bounce(i think the key/keyway is bad on one of these) but as the table starts to raise the eccentric slips (kind of like it's skipping gears) i think that is due to the weight of the table shifting on the table drive but could bad bearings cause this? if we tighten it it seems to go away for a while but will reappear in time. it's just kind of annoying, you know?thanks for you input guys.

alex

[8270king]

Re: table drive ass'y?

My guess is it is loose on the shaft.

Jerry

[Jimmy Jam]

Re: table drive ass'y?

Throw a new lock nut on. It sounds like you found the problems.
Maybe the spot/respot rod got bent from a bowling ball and its binding against the bottom of the shifter cam, holding the table up at 180?

This is fun.

[Lampie]

Re: table drive ass'y?

Quote:]Originally posted by Jimmy Jam:


This is fun.[/QUOTE]

It's No Fun if you have to deal with the problem.
I just remember another reason that can cause this problem: not enough pressure on the clevis(yoke assy)caused by a too strong table balance spring(I did get a wrong one one time, it was realy a tough job to get the spring installed but I did it (!) but after that the table didn't go to the lowest point every time, leaving a gap between the bearing and the clevis end, causing the same problem descibed above.
Changing the spring(again*#^*) was the solution( the spring was about an inch shorter than the ones we use to have).
After that it was fun again!

Los Glampos

[Dutch]

Re: table drive ass'y?

Oooh… a couple of things I've never seen before. [img]/content/btubb/images/%%GRAEMLIN_URL%%/eek.gif[/img] That doesn't happen too often.

If you tighten it & it's OK for a while, I like JJ's idea of the new lock nut. (Or maybe just a drop of locktite)

I've also seen a table bounce during spot cycle due to sticky yoke leg bushings. [img]/content/btubb/images/%%GRAEMLIN_URL%%/mad.gif[/img] (Learned that one recently)

Dutch

[TheGMan143]

Re: table drive ass'y?

I had a problem similar to that... the bearing in the clevis (the one in the rod-end, next to the hub)was worn, and it would bind up every once in a while. The table had the same kind of motion... a kind of 'bounce' in it that would toss pins around when spotting. After I changed it out, the machine went right back to normal, and hasn't given me a problem since.

[Dutch]

Re: table drive ass'y?

BTW, never buy a whole TBL drive assy. They're way too expensive & not hard to rebuild.

Dutch

[Ar Rar]

Re: table drive ass'y?

If the table drive becomes loaded with old grease, it can become sticky when it turns, especially at the bottom of the stroke where the table springs are counter-balancing the weight of the table. This can cause table bounce. A simple check is to disconnect the clevis and give it a spin. If its dragging, you'll know it.

Roger

[the old dirt man]

Re: table drive ass'y?

Quote:]Originally posted by Ar Rar:
If the table drive becomes loaded with old grease, it can become sticky when it turns, especially at the bottom of the stroke where the table springs are counter-balancing the weight of the table. This can cause table bounce. A simple check is to disconnect the clevis and give it a spin. If its dragging, you'll know it.

Roger[/QUOTE]

ROGER,does wagon wheel still have the 82/70 b machines or did they just convert them to mp [img]/content/btubb/images/%%GRAEMLIN_URL%%/confused.gif[/img] I knew the old head mechanic MONTY that was there in around 75.and is DOUG P. still there I knew him back in about 76 and only talked to him once since then is he still fat like me
[img]/content/btubb/images/%%GRAEMLIN_URL%%/laugh.gif[/img] tell him hi.and ask him about pro bowl in san pedro. GLENN

[Ar Rar]

Re: table drive ass'y?

Crud:

The machines are MPs. Monty still bowls at the wheel and Doug is our main man. I am a refugee from a Brunswick house that closed, so I no longer have a light bar to stand on. [img]/content/btubb/images/%%GRAEMLIN_URL%%/laugh.gif[/img]
I'll give Doug your message when I see him on Tuesday.

Roger

[the old dirt man]

Re: table drive ass'y?

ROGER
your not the ROGER that used to work at JAVA LANES a long time ago when DON BELL was there are you [img]/content/btubb/images/%%GRAEMLIN_URL%%/confused.gif[/img] CRUD