Using Sub Spindle as a Tailstock On a Doosan Lynx 2600sy

[workpiece pushing check]

Hey Everyone, I'm Currently doing a job where I cant grip on the id to OD turn the part as its only got a 1.5mm wall, I've been looking around for a way to use the Sub spindle as a Tail stock.

I'm currently running it and changing the B distance for each part as the vary in size.

I was wondering if there is anyway to create a Marco or any G code that once the sub spindle detects a certain amount of torque it will stop at that position and stay there.

I have seen people using m300/m301 however i cant find any examples on how and what to do.


Any replies would be greatly appreciated.

many thanks

 

[Triaged]

Are you using a spring loaded center like the one from Royal? https://royalproducts.com/product/10590/

 

[ManualEd]

Are you using a spring loaded center like the one from Royal? https://royalproducts.com/product/10590/

I use a spring loaded live center in the sub of my mazak and it works great.

This style is slightly cheaper, as they're not designed to be ultra-compact for turrets.

Royal Spring-Type Live Centers – Royal Products

royalproducts.com

 

[Milling man]

I was wondering if there is anyway to create a Marco or any G code that once the sub spindle detects a certain amount of torque it will stop at that position and stay there.

Yes, of course. See on G31 in torque mode.

 

[EKrol]

Use M86. If you activate M86 the torque skip get activated. On our 2600SY you can set the torque in the data table. Look in your blue book. If you set the value to 30% the load will only go to 30% and than stop moving. Don't reset machine while the function is active and there is load on the b-axis. If you press reset the torqueskip deactivates and the load will go to maximum and machine alarms out.

 

[workpiece pushing check]

Reply to the top two im currently not using one i was just using a bung that had been placed in the sub spindle, however we have one at work and will give it go,

also ill try m86 and see if that works and adjust the torque.

Many thanks guys ill keep you posted see if any works

 

[EKrol]

Reply to the top two im currently not using one i was just using a bung that had been placed in the sub spindle, however we have one at work and will give it go,

also ill try m86 and see if that works and adjust the torque.

Many thanks guys ill keep you posted see if any works

Don't rapid the b-axis after activating M86. It will overshoot. Rapid the b-axis to a safe position like 10mm then activate M86 and move against the part slowly. To deactivate first move to a safe position like 10mm then deactivate with M87 and you can rapid the b-axis home.

Example:
Program start:
G54
G98
G00 B10.0
M86
G01 B0.0 F500.0

(Do your machining)

G98
G54
G01 B10.0 F500.0
M87
G53 G28 B0
M30

 

[DouglasJRizzo]

The answer is yes, the sub can be used as a tailstock.
Here's part of the training manuals I wrote when I worked for Doosan/DN.