RFQ - custom 43mm spindle mount

[Web Goblin]

My machine is down for a little repair/mod or I would quote you for one, got some 25mm alu in the shop. I'm sure Jonathan will be along soon to have a look at it. My plan as well was to do some motor mounts for ebay perhaps but we will see how that goes.
I have had a play with your dxf and I think you may have a problem with getting 5mm bolts into the holes. I take it you would be using a 25 to 30mm long bolt depending on the thickness of the tool post you are bolting on to. You might need to reduce your outer diameter a bit to be able to get the bolts in without them hitting the side of the mount. But then again you could always mount studs in the tool post then just fit nuts to clamp the mount to the post. Might also be better to make the holes 1mm larger diameter, this will give you a bit of adjustment. The 71mm pitch isnt a problem, you can just mill a drilling jig to get it spot on if you really want to.

Ian

[Jonathan]

Jonathan will be along soon to have a look at it.

I'm 12 hours late :(

My plan as well was to do some motor mounts for ebay perhaps but we will see how that goes.

You're not the first.

I have had a play with your dxf and I think you may have a problem with getting 5mm bolts into the holes.

The other way to get round that is make the hole a slot, then you can insert the bolt at an angle to get round it. To ensure that the screw fails before the thread strips you need about 8mm thread engagement with M5 into aluminium, so since the mount is 18mm thick you'll be fine with a 25mm bolt. Not that it really makes a lot of difference here...

The 71mm pitch isnt a problem, you can just mill a drilling jig to get it spot on if you really want to.

I'd just spot and drill it on the milling machine (or router would work, but not as fast)...no need for a jig as it's a one off.

Anyway..
I have some 3/4" aluminium, so I could cut you one from that. Also got some 1.5", but that's a bit much...especially as that bolt has to squash it to clamp which is going to take more force with a greater thickness. Could have more bolts if it was thicker though. Two clamping bolts could fit with 3/4" but I doubt it's necessary.
The problem with me doing it is I'm at University so I can only come home to do it some weekends. Got some bits to cut out for luke11cnc next weekend and a spindle mount... so if you don't mind waiting a couple of weeks I can do it.