Thread: Auto spindle lock
I want a spindle lock so I can prevent any shift on the milling spindle when I do finishing cuts.
Pneumatic seemed the best bet for CNC control so I just bought a ram (32mm piston, 5mm stroke) and a solenoid valve off fleabay.
Started designing complicated lever mechanisms to tighten the spindle lock bolt, then it occured to me it could be totally simple.
If I drill a clearance hole through one end of an iron bar.
Put it under the spindle lock bolt head, as you would a washer.
Put the ram so it tries to lift the other end and tilt the iron bar "washer".
Surely that would lock the spindle with lots of leverage, be totally adjustable and I can still lock the spindle manually if I feel like it.
So why won't it work? Nothing can be that simple :D
Not enough power.
My machine doesn't have a cotter it uses a pair of wedge thingies that need pinching together.
The cylinder will give me around 100 lbf with shop air, reckon I need more like 500 lbf.
The idea is to use a crowbar action between the spindle lock bolt and the non-threaded wedge thingy :D
I've got the valve, now waiting on the postman for the pneumatic hose and fittings.
Wonder if the solenoid coil is rated continuos, may need to add a fat cap and resistor to reduce the holding current. I bought two coils so I can afford to have a whoopsie :D
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