CNC Router V1.0 (For Cutting Multiple Materials)

[biketrialsdave]

It looks as if it will be easier to mount the X axis motor on the outside of the gantry plate (See below). If I wanted to mount it on the inside and still use the FK bearing block then the shaft would be too short to mount a pulley.



I am now looking at the Y axis ballscrew mounts in a little more detail. In the screenshot below how is the bearing mount attached to the steel box section? (Does anyone have a link to this build thread btw?)



I assume that there's another piece of welded steel plate on the end of the box section? As below?



While I am on the subject of the "end plate", I assume some sort of adjustment will need to be built in to allow movement in the Z axis as if I use the epoxy method on the box section then it's going to add some height?

Dave

[biketrialsdave]

Yet more questions... this time about welding and distortion.

What is the best technique to use to minimize distortion? I assume I should tack weld each side of the box section before doing full fillet welds? Do I need to do any kind of stress relief to the joint after? I am only practicing at the moment. Picked up an Evolution Rage 3-S to cut some box section and purchased an auto darkening helmet =)

I've also ordered one of these, which I hope will help:



Dave

[biketrialsdave]

I am now looking at the Y axis ballscrew mounts in a little more detail. In the screenshot below how is the bearing mount attached to the steel box section? (Does anyone have a link to this build thread btw?)



I assume that there's another piece of welded steel plate on the end of the box section? As below?



While I am on the subject of the "end plate", I assume some sort of adjustment will need to be built in to allow movement in the Z axis as if I use the epoxy method on the box section then it's going to add some height?

Dave

Is anyone able to answer any of the above? It would be great if there was a link for the red router listed?

Cheers,

Dave

[JAZZCNC]

Is anyone able to answer any of the above? It would be great if there was a link for the red router listed?

Cheers,

Dave

Again it's one of mine Dave and no build thread as these where built by me for someone off forum.

[biketrialsdave]

Again it's one of mine Dave and no build thread as these where built by me for someone off forum.

No problem JAZZ. I'm currently making some changes as we speak. A few questions are now arising:

1. What pulleys do most people go for? XL? Not sure on pitch etc.
2. Is there a way of extending motor shafts so that I can overcome this problem below?


3. Is 10mm of motor mount adjustment enough for belt tensioning?



Some progress on the Y axis too:

[Wobblycogs]

What most people do is rout out a recess for the stepper to mount in so you've got only maybe 5mm of material where the stepper sits (see here). That way you generally get enough shaft to mount a pulley on directly without needing an extension.

I don't think 10mm of movement will be enough for tensioning, especially not on a long belt. I'd go for more like 25 or 30mm if you can.

[JAZZCNC]

#1 Use 15mm wide 5mm pitch HTD pulleys and belts.

#2 Need extensions made on lathe but much easier to use BK/BF bearings inot profile and belt/pulley like shown in my picture on other thread.

#3 20mm slot.

[biketrialsdave]

Tonight's updates:



Still not 100% sure on the way I have attached the "end plates" as seen below. I.e. using 5mm steel plate welded to the box section and tapped with two M6 threads.

[Wobblycogs]

The stepper in the first two pictures looks large for the size of machine you are building, are the 34s? I would have thought 23's would be enough for a machine of this size, especially if you have slaved motors.

The connection between the gantry screw and the top plate (third picture) looks like a weak point. I'd try and make it thick enough that it covers most of the body of the ballnut.