[stuck]

Hello all, I need some help here.

Just received my BT30 spindle from Aliexpress today and I have plans to change out the stock bearings with higer speed ones in few weeks time.
The problem is I can't seem to unscrew the nut on the drawbar assembly using a wrench. Do I need a specialised tool for that nut?
Attached is a pic of the mentioned nut in the yellow box.

Thank you in advance for any help!

[Azalin]

It is threaded I think. Does it not have flats to fit a wrench?

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[stuck]

It is threaded I think. Does it not have flats to fit a wrench?

Sent from my MI 5s Plus using Tapatalk

I just figured it out. The collar below the nut needs to be removed first by loosening the grub screws on it's side.
Next, loosen the 3 grub screws on the pulley to get it off the spindle shaft, and then I have access to the bolts on the cap below.
I'll figure out the rest later today.

[smihai]

Hope the thread is not too old ...
I need some help and suggestions about taking out the drawbar from a similar bt30 chinese spindle ( see some pictures ).
Cannot tell what exactly are those 3 grub screws ( 2 radial &very small, one larger on the axe) holding/presetting. Inside ( under the largest grub screw) there is a threaded bar.

Reason to take it out is the holding force ( 250 lbs) measured with a clamprite gauge.

[smihai]

ok, it was simple ... unscrew the part at the end of the shaft ( third picture) from the drawbar inside ( the threaded bar I have mentioned before). the drawbar will go out through the taper side and the bellevilles will remain in the shaft.
I have 90 springs, 23x12.4x1.4 (could be .3 ) donno what material is used. stack is 2 in parallel with 45 in series
Most probably the drawbar was not properly pre-tensioned therefore giving only 250lbs.