HSSToolChange

The high speed spindle has a precision collet that needs a little care when changing tools. Two sizes of collet are supplied with the spindle, 3mm and 6mm and both require the same method to change tools. See the notes later about changing the collet.

Removing a tool

Two spanners are required, the narrower end is used to hold the spindle, while the wider end unlocks the collet nut. Start with a spanner in your right hand, small end towards the spindle, and turn the spindle with your left hand until the spanner locks in with the spanner at the 3o'clock position. Then take the other spanner in your left hand, and engage with the collet nut at about the 7o'clock position. Push the two spanners apart to loosen the nut. At this point it is worth putting the left hand spanner down, and unscrewing the nut until it locks again. Since the collet is a tight fit in the housing, there is a release mechanish built in which allows you to extract it. When the nut locks again, replace the spanner and undo the nut further. I good tool will simply drop out of the collet at this point, so it is useful to hook ones fore finger round the tool as you undo it to prevent it droping onto the work. While this may seem a little tricky, with a little practice it is quite simple to achieve without needing a third hand.

Installing a tool

Installing a tool is a little easier but is basically just the reverse process. Hold the spindle in position with a spanner in your right hand, slide the tool up into position. Most tools will just push tight into collet, but some may be left sticking further out. Just make sure that a good 10mm of tool is clamped in the collet. The tool is held in position with your fore finger while you tighten the collet nut with the other fingers, once finger tight the tool will not drop, and at this point apply the second spanner at the 7o'clock position again and bring the spanners together to about 5 and 6 o'clock. You do not need to apply too much pressure as the collet will hold tight with little pressure.

Changing the collet insert

Once the collet is loose and the tool removed, unscrew the collet nut completely. The insert will come with it as it is locked into the nut. Once out on the bench, use a piece of wood to push the insert out from the nut. supporting the nut on a vice leaving the insert free can help, but normally you can just manage it in your hands. The alternate insert can then be pushed back into the nut until it locks into the extraction spring. You do not need a lot of pressure, so simply move the insert slightly to one side as you push it in.

Cleaning

I normally just wipe the collet inserts with a little WD40 to keep them clean and rust free. store them in a plastic bag to prevent them getting damp.