Lazy sweep

[John_Galt]

I have been fiddling with this machine for close to a month now.

Problem is as follows:
Every once in a while, the sweep fails to raise from 2nd guard. A little flick of SA follower will wake it up.

SA cam and follower adjustment reduced the number of stops caused by this problem, but did not eliminate.
I currently have SA adjusted so that it just barely comes all the way out to 270*, and follower is as touchy as possible. (Max adjustment.)

Still, it will not raise up sometimes.

For lack of any other explaination, I have decided that this sweep is just lazy and does not want to pick it's fat arse up off the deck.

Unless you have any suggestions, mi amigos...
Thanx in advance,
Chaddy-Poo

[8270king]

Re: Lazy sweep

Check the adj. on the TB or T2 switch. The middle switch on the table cams. I believe you might find your problem there.

Jerry

[ November 08, 2001: Message edited by: 82/70 king ]

[GPS]

Re: Lazy sweep

On an older 70 as I have the sweep runs from 270 to 0 through ta-2 normally closed. On newer 70's that circuit is completed by ta-1 normally closed. With machine at 0 put an ohm meter on the corresponding terminals in the wireway and manually open the switch that applies to your machine. Watch for ohm readings that vary. Good Luck

Mike

[Pindecked]

Re: Lazy sweep

I wouldn't rule out a bad Sweep contactor,or ,a lousy C-1 connection...or have you tried another chassis?

I have one that does the same thing(sweep stopped at 270) once every 5-10 days,,,but, when I get down back, the top rear wire on the sweep contactor is smoking,& the sweep motor overload is tripped.I'm sure the contacts need replaced on the contactor.

[the old dirt man]

Re: Lazy sweep

CHADDY
I have had this problem a number of times over the years and it's been the sweep coasting backwards after it stops at 270-2nd guard.
it may not be coasting all the time [img]/content/btubb/images/%%GRAEMLIN_URL%%/confused.gif[/img]
you might have to watch it for a number of cycles as the motors like to coast more after they warm up. CRUDDY
:p

[MikeM]

Re: Lazy sweep

I think Crud Man has it. If the machine did spot pins and the only thing you do is tick the SA, the sweep coasted backwards. It will no longer be on the higher point of the cam. You can do a quick check when it happens to see if the plunger is on the SA micro.

[Lampie]

Re: Lazy sweep

Yes Crud is right(and I know he knows everything about sweeps going backwards,LOL, so I think you can believe him).
One of the reasons can be a worn out sweep drive shaft or crank arm(and I know everything about worn out things, so I think you can believe me).

Los Glampos

[John_Galt]

Re: Lazy sweep

Gentlemen, thank you thank you thank you for all your input.
Tonight, I will fiddle with all manner of things that might cause the sweep to coast backwards, and report my findings.

Chaddy AKA Los Chaddos

[John_Galt]

Re: Lazy sweep

P.S. Cruddy - sounds like you are really on the right track as it never happens early in the shift - only after everything has gotten nicely warmed up.
CC

[mechanic8230]

Re: Lazy sweep

Glenn,
Looks like you saved another mechanic. Where would we all be with out your knowledge and Lampies humor?

[John_Galt]

Re: Lazy sweep

Well, I didn't have a chance tonight. The gearbox died.
I guess the little problem became a big one.
It'll be interesting to see what puked in the gearbox.

[the old dirt man]

Re: Lazy sweep

CHADDY
sorry to here the motor died. [img]/content/btubb/images/%%GRAEMLIN_URL%%/frown.gif[/img] I was just about to tell you how I stop motors from coasting.
well I'LL tell you anyway you put 30 to 40 cigarette butts in the gear box depending on how bad it's coasting.
[img]/content/btubb/images/%%GRAEMLIN_URL%%/eek.gif[/img]
then they stop on a dime then you hope you never have to take the gearbox apart.
it also works on be motors just put 10 to 15 on them and it works better then stop leak :p
by the way do you know anybody that exchanges motors. CRUDDY

[ November 09, 2001: Message edited by: CRUDWEISER=BUD ]

[Jimmy Jam]

Re: Lazy sweep

I don't know how the MP's work but you might want to give the OffSpot wires a once over. For what ever reason if you get a OOR signal when the table is at 180'ish the sweep will freeze. Maybe something is happening with them only on the spotting cycles long stroke?

[John_Galt]

Re: Lazy sweep

Quote:]Originally posted by CRUDWEISER=BUD:
CHADDY
sorry to here the motor died. [img]/content/btubb/images/%%GRAEMLIN_URL%%/frown.gif[/img] I was just about to tell you how I stop motors from coasting.
well I'LL tell you anyway you put 30 to 40 cigarette butts in the gear box depending on how bad it's coasting.
[img]/content/btubb/images/%%GRAEMLIN_URL%%/eek.gif[/img]
then they stop on a dime then you hope you never have to take the gearbox apart.
it also works on be motors just put 10 to 15 on them and it works better then stop leak :p
by the way do you know anybody that exchanges motors. CRUDDY[/QUOTE]
ROFLMAO!!!
[img]/content/btubb/images/%%GRAEMLIN_URL%%/laugh.gif[/img] [img]/content/btubb/images/%%GRAEMLIN_URL%%/laugh.gif[/img] [img]/content/btubb/images/%%GRAEMLIN_URL%%/laugh.gif[/img]

On a serious note, thanx for all the tips everybody. All could be possible culprits.
This one, however is the ring gear (around the gearbox output shaft). 785 501 179
You should see the teeth (or lack thereof) in that thing!!! Uggggly!!!
Made me want to hurl!

It was severely worn in three equally-spaced points (corresponding with the helical gears in the cage assembly).
I figger that this position is where the sweep stops at 2nd guard, and with no teeth to stop the sweep from coasting back, it did.

Funny thing is, the helical gears all look very good. The oil was extremely filthy, but I did not find any ciggy butts in it. Maybe that's the problem...

It's run fine since I replaced the gearbox.
Yup.

Chadrick

[the old dirt man]

Re: Lazy sweep

CHADDY,
from the part # you indicated I'M guessing it's a westinghouse motor you need to repair [img]/content/btubb/images/%%GRAEMLIN_URL%%/confused.gif[/img] well I hope you don't have to use vantage parts [img]/content/btubb/images/%%GRAEMLIN_URL%%/laugh.gif[/img] I haven't had very good luck using vantage parts in the gear box they never seemed to match up.
but with the new owners of vantage maybe they can straighten out the screwed up parts they have been selling for years :p
and yeah I have seen your posts about you reparing motors for vantage. good luck CRUDDY