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Linear actuator for drill press table lift


mad_pete

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Got a Elliott progress 1s pillar drill and it’s very nice but a powered table lift wouldn’t go  amiss. Looking at getting one or two actuators 65 Cm long with maybe 35 Cm extension to power it up and down. Anybody used these and can recommend where to get them ? I’m looking for £75 ish if possible. Also if anyone has suggestions on how to make a lift that’s welcome too.

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Mine has a rack and pinion to lift the table. The handle is on the back of the table with the rack through a slot in the table. The rack sits on a collar on the shaft without being fixed to it so that you can still rotate the table. Pretty standard on this sort of thing but I can take a photo if it would help.

I've seen them used for lifting TVs out of bed frames or car dash boards, might be worth searching with those criteria. Does seem quite elaborate to me though? Are you going to lock off before you drill? If not make sure it's man enough to take you pulling down with the drill.

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So this is it. Table is cast iron clamped on the (solid) metal column. 

 

776A5297-9F74-4868-87C2-5C7323E5963D.thumb.jpeg.8a52eca75216f8435ebc3544ecc6aabf.jpeg

 

Have about 70mm to fit something underneath 

 

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think i I have to lift near the column to stop it binding . 

 

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couple of threads in the table I could maybe connect to.

 

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and my £1.04 ebay linear actuator is on its way.

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The thread on your 3rd photo down looks like it's on the bit of the table that pivots for drilling angles so I would avoid that bit. I wonder if that hole is supposed to have a spring pin in it to automatically register horizontal?

 

Bargain actuator though!

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TBH I have an old Meddings like this, and I've not found the need for a lift mechanism.

 

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After more thought, I reckon one like this has enough weight in it to hold itself still when you lift the table. Bench mounted models are lighter and probably more inclined to move as you lift the table.

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  • 2 weeks later...

So got my £1.04 actuator and dug out a 12v power supply and it seems good. Pleased with that.  Trying to think how to stop it pivoting on the lift.

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Possibly enlist axle stand help. However I did find an antique linear actuator mechism in the form of some Range Rover jack (I think).

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and that with a motor on top might go nicely. Maybe a collar on the shaft and weld the end of the jack to it with some feet coming forwards perhaps.

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  • 4 weeks later...
  • 2 weeks later...

Here how I would approach this:

2mm plate (maybe 4" x circumference of the leg plus four inches) and a couple of big G clamps or quick grips. 

Grip the plate to the leg with the long edge against the bottom of the table, leaving an inch overhanging. Bend the plate around the leg, moving the grips closer to where you're bending all the time. Once you've got 180 degrees round, take it out, cut off leaving enough to bend some tabs outward in the vice. Repeat. You'll end up with two brackets that nearly fit around the leg with the flanges sat flat together. If you want to be clever, leave space between the flanges on one side for the actuator to fit between. Drill holes in the flanges to bolt together. To finish it nicely, cut what is essentially a big washer to fit between the table and your newly made piece. You could do this with a band saw, chain drilling, grinder or hole saws - whatever you have available. The actuator can bolt to the bracket to raise the table, either between two flanges (probably the sturdier) or to the side. Gravity will do the rest. 

Low tech, removable and easily fitted :)

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  • 3 weeks later...

Okay so looked at a new actuator because it would work more easily with the joy stick.3DDEEC18-605F-4905-BAF0-25A0FDB24A15.thumb.jpeg.269c1db7ec3663986f50335dd7cfe0fc.jpeg

thats plan b

then  I decided 76mm od tube with 3 mm with is 70 mm id (I hope).

 

turns out it is close enough.

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but to use my original actuator with my joystick I need some less simple wiring so :

 

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And that works so next is to cut the tube so I can clamp the bottom and a top bit that the actuator will move.

I was planning to use full length of tube but clamp should make it more flexible.

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  • 1 year later...

Right some progress. With basic brackets it all lines up very well. The power up and down is really really nice. I’ll look to pop a video up. 
Getting a slight twist on the table as it powers up and sometimes it needs a help to start coming down but I think a small power up then down sorts that. 
 

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