1028 Main spindle lockpin in alarm? (but I dont have a lockpin) :(

[MCImes]

I have a Tsugami swiss lathe that has had a bug up its ass lately giving me lots of alarms and random stuff.

I tried looking up the alarm in both the fanuc manuals and the tsugami manual and neither has the 1028 alarm listed. I assume since its a 1000 alarm that its a factory installed alarm? (by tsugami, not fanuc)

if it helps at all it alarms out when the program hits M50 (spindle C axis positioning) Normally I hear 3 puffs of air when m50 is called. Currently I only hear 1 then it alarms out with the "1028 m.sp. Lockpin in Alarm"

I also assume my lathe does not have the physical spindle break (only electronic) as MDI will not accept m82 or m83 (spindle lockpin in/out)

The program was a previously saved/working program so Im 98% sure its not an issue with the code. I also compared it with a couple other programs just to make sure I wasnt missing anything and it all looks right.

... so...any ideas?
(thanks in advance)

[tc429]

yes, 1000s are generated in the ladder program...didnt mention which control you have, guessing its likely a zero as they are so darn common...some versions list a big block of 4 digit numbers in the ladder under the disp/sub49(i think sub 49) block instruction...

hopefully ladder has text, but if not, you can find the cause 'the hard way' by deciphering the block data:

the way the fanuc messages are created, the block instruction reserves a chunk of addresses in its first parameter, the second parameter tells how many pieces of data per message, then the last parameter is the beginning byte...then all the 4 digit data.

say purely for example, the parameters are 120, 10, R500

this defines 12 messages, each 10 pieces long, first message called by activating R500.0, 8th by r500.7, 10th by r501.2

if you count thru the pieces of data, looking at every tenth 4 digit piece, it will be a number in the 1000 or 2000 range...find the 1028. if say 1028 is the 4th one you come across, then it would be called by R500.3

(the next nine 4-digit pieces will be the text- 65=a and so on...6566 8990 will display as ABYZ, a 32 in there generates a space...yes, this is a totally stupid way to generate messages, but it works...)

the 10/11/15 series controls were easy- they simply had a page of A addresses that you typed text into...

w-search r500.3 and you can see the logic that causes the error. good luck

oh- please post your machine model/control- might get lucky and find someone familiar with the same model

[underthetire]

Actually, some tsugamis did had a lock pin. Early machines had a separate servo motor that engaged I believe to run the c axis, some were just indexer type c. The air you hear is probably an air cylinder trying to engage. Remove head covers and inspect.

[MCImes]

Found the problem. as underthetire said I do have a lock pin. My lock pin in sensor had a broken wire so It would only get signal some of the time. It tricked me because there is no M code for lock pin in other than M50 "spindle indexing on." Looks like I need to solder a new one in.

Just for anyone in the future with this problem the lock pin air cylinder hides behind the encoder that sticks up off the spindle. Even after it alarms out you can loosen the set screw on the sensor and adjust the position on the bottom of the cylinder to see if you can find a position that works. The LED will light up when it senses "in position". After I couldnt get it to light up in any position I followed the wire back, wiggled it, and got it to light up. I tried taping the wire to support it but the spindle back and forth dislodged it again so time for a new one.

Thanks for the help!