Warco Major CNC build log

[Robin Hewitt]

Does your quill twist....peg in slot or other type of guide?

Peg in slot, slack enough to convince me that I can't hang a spindle motor off the side.

Only got an hour on it last night, wife dragged me down the pub, forced me to drink beer then drove me home. I was in no condition to continue.

I did cut the extra relief in the cheeks so the motor plate can slide home then bored and faced a 40t XL pulley to fit the ball screw shaft.

Took the camera but forgot to put the memory card in it so no pic.

Robin

[Robin Hewitt]

Me again

Put the pulleys on, belt was too short.

Checked all the measurements, I don't usually get a belt wrong.

Eventually found I'd mounted a 44t pulley where a 40t was required

RS seem to be taking orders at 7pm for next day. Wonder if I'll have it tomorrow. Perhaps it will it be a 44t pulley in a 40t bag, don't remember buying a 44t, fairly sure it said 40t on the bag :naughty:

Robin

[Robin Hewitt]

40t pulley just arrived. RS must be slacking, I ordered it at least 11 hrs 30 minutes ago :naughty:

You must feel awful so I'll not mention that I intend using a pair of 30mm SC30UU linear bearings to prevent the trig equation needing to be worked out :D

Okay, curiosity aroused, what trig?

Robin

[Robin Hewitt]

11.5 hours....useless!

Strangely true, when I looked in the box I found an empty 44t packet and a brand spaking new 40t. Nice to have a spare I suppose

My thought on the swivelly bit at the bottom..if it twists it shortens the effective length of the ballscrew=bad?

I don't think it can twist without bending the screw, I didn't stint on the metal :nope:

I now have the 40t pulley and belt in place with a faux honking plate fudged out of a bit of 2" x 3/4" iron.

It feels good, any shift on the motor moves the handle, moving the handle spins the motor. I would have wired it up but when I looked for a bit of chocolate block connector all I could find was 80A

Time for some G-code to make the real honking plate

Robin

[irving2008]

Strangely true, when I looked in the box I found an empty 44t packet and a brand spaking new 40t. Nice to have a spare I suppose




I don't think it can twist without bending the screw, I didn't stint on the metal :nope:

I now have the 40t pulley and belt in place with a faux honking plate fudged out of a bit of 2" x 3/4" iron.

It feels good, any shift on the motor moves the handle, moving the handle spins the motor. I would have wired it up but when I looked for a bit of chocolate block connector all I could find was 80A

Time for some G-code to make the real honking plate

Robin

Is 'honking plate' a real term or one you made up to describe a 'big lump o' metal'?

I am looking at the pics but still not seeing quite how the quill gets moved... and still moves the motor when you turn the quill handle...

[John S]

It's actually British Standard Honking Plate.

[Robin Hewitt]

I am looking at the pics but still not seeing quite how the quill gets moved... and still moves the motor when you turn the quill handle...

The frictional losses on a ball screw are low. The screw can turn the nut if you have the means to push hard enough.

Spin the motor by pulling on the handle and you can feel if something is binding. Should be smooth

[irving2008]

The frictional losses on a ball screw are low. The screw can turn the nut if you have the means to push hard enough.

Spin the motor by pulling on the handle and you can feel if something is binding. Should be smooth

Ah, what is the lead on the screw... I hadn't realised it was that big a lead. But what stops the quill dropping under its own weight then when the motor is powered off? Or is there sufficient stickiness in the cogging to stop that?

[Robin Hewitt]

It's 5mm lead, the 32:40 pulley reduction gives 4mm/motor rev

The quill return spring is there but it wouldn't drop under it's own weight anyway. You gottta pull to spin it.