marker pen driven over an 8x4 sheet help.

[Danny]

Thanks Jazz sorry for the dumb questions its getting a little clearer to me bit by bit, yep those Ebay links have gone now ill hunt down the Seller and try and find a new one, looking at the shaft coming off of these steppers there must be a way of connecting the pulleys?

[JAZZCNC]

Thanks Jazz sorry for the dumb questions its getting a little clearer to me bit by bit

Don't worrie one bit about Asking Dumb Q's I for one fully encourage it and pritty much sure they'll have been asked before.!!

looking at the shaft coming off of these steppers there must be a way of connecting the pulleys?

When you buy pulleys most often they have just a pilot bore in the centre and come with a Boss on one side. This Boss is drilled & tapped, often in 2 places, then a grub screw inserted which clamps to the motor shaft which often have a flat on one side, if not it's a good idea to grind a small flat your self. The centre pilot bore is then machined to suit the motor shaft.

You have to be carefull regards motor shaft length and the thickness of the motor mounting plate.? If the plate is too thick you won't have enough shaft sticking out the other side.
Often with steppers you'll find the shaft is realtively short so doesn't allow the shaft to pass all the way thru the pulley.? one way to get round this is to either machine away the boss or turn round the opposite way then drill between the teeth for the grub screws. If done this way you must ensure the grub screw is below the surface and no sharp edges from drilling & tapping other wise it will damage the belt.

If Machining pulleys etc is a problem just ask.

These pics may help.?

[Jonathan]

This Boss is drilled & tapped, often in 2 places, then a grub screw inserted which clamps to the motor shaft which often have a flat on one side

I'll add it's a good idea to put a small brass bar in the tapped hole between the grub screw and motor shaft as the brass, being a bit softer than steel, will stop the motor shaft getting marked/burred. If you don't it can cause problems trying to get the pulleys off. I would also threadlock the grubscrew to stop it working loose.
Brazing rod is a handy source of brass bar the right diameter...I just part off lots on the lathe then try and find them.

[JAZZCNC]

I just part off lots on the lathe then try and find them.

Your a sick sick boy or sadist not sure which.:rofl:

Belt hole punch pliers and thin brass sheet is much easier.:whistling: