pins off spot

[jandlcox]

I have a machine that I cannot get the pins on spot right now they are to far forward by about a half a spot. I move the table back as far as I can, didnt help. If I move the spot rod so the pins are spot the latch assembly will not let go and the pins double shuttle. Everything else looks pretty tight no play. Thanks for any help

[8270king]

Re: pins off spot

Is the #1 pin on spot and the others off spot?

I have had the casting that connects the lightning rod to the #1 table shaft bend. This will cause all the pins esxcept the #1 to be off spot forward.

[old-school-mechanic]

Re: pins off spot

Has this always been like this ?? Or did it just start over night ??

If the ajustments are right. And king didnt hit on it.
Check the actuator arm and cam follower that rides inside. If the arm is loose and the key is sloppy. Causing the #1 shaft to slip. That will cause your problem. Also if the cam follower that rides inside is worn or the groove is worn larger. That also will give you that problem.

If table height and all adjustments are correct.
I'd start here
If you have not checked table height or made sure everything was adjusted right. Then I'd start there

[Andrew]

Re: pins off spot

I found exactly what King said a few weeks ago. The lever casting bolted onto the #1 X frame shaft was bent. Every pin was wobbling on spot except the 1 pin. The worn bushings in the zig-zag link (a.k.a. lighting rod) were also crap-o-la and that made it all worse. All 'cept the 1 pin were under-pivoting as a result (hence wobble).

However, for you, I'm suprised it would make a half-spot difference as you describe, unless it's seriously bent (understatement). Therefore, I would be looking at the cam on the shifter link as Old-School suggested or the half-bubble adjustment (x-frame stop bolt).

Though, I'm still pondering how you would get half a spot difference out of a bad half-bubble adjustment, or any 'normal' adjustment. The whole x-frame moves less than half a spot, making it seem more of a general table position problem than a spotting operation problem. Are you sure your flag adjustment is on spot? Sorry I'm sounding less helpful the more I write.

I'll shut up then.

Andrew.

[Brunsamf]

Re: pins off spot

Is the scribed line on the machine frame in line with the center of the back row of spots?

[JJP]

Re: pins off spot

Check the spot/respot cam to make sure it's not worn down because of a seized cam follower

[Alastair]

Re: pins off spot

I have replaced the latch hook on a machine before that had this problem. The spot rod when adjusted would lock the latch causing double shuttling, so the pins would be off there spots.

For some reason Ive found different types of latch hook in the back. Ive also grinded some off the latch to help gain the clearance needed to spot the pins.

At the end of the day I believe this is caused by the positioning of the front of the machine. Where the machine is bolted into the U channel. You may find you have to move the front of the machine forward or backward to solve the problem. Remember to add or remove shims in between the pit section to achieve 6 1/2 inches from pit to 7/10 line.

[maister]

Re: pins off spot

check the spring hanger and the bolt behind the spotting rod are not worn.it is surprising how many times this is missed.
maister