Here we go again . . . MK4

[routercnc]

DOH! Just looked at the thumbnail for this video and noticed that the corner plate is held on with cap head screws - they should have been button head screws. I watched the video again and the other 3 corner plates are held on with button head screws. Hopefully no-one noticed

[routercnc]

Episode 7 now ready . . . . lots of small jobs

[Davek0974]

Amazing, pure machinery porn.

The only thing I could add, based on the detail level in that axis is - where you have the grub screws for head tramming bearing upon the aluminium plate I might bore some recesses and let in some small steel pads, aluminium will give a little over time and your head could lose tram, especially when looking at the tolerances you are shooting for ;)

[routercnc]

Amazing, pure machinery porn.

The only thing I could add, based on the detail level in that axis is - where you have the grub screws for head tramming bearing upon the aluminium plate I might bore some recesses and let in some small steel pads, aluminium will give a little over time and your head could lose tram, especially when looking at the tolerances you are shooting for ;)

Hi Dave

I think you are right and it will give over time. I had gone for big grub screws and lots of them to spread the load but aluminium is soft. I could do with washers without the holes - don't fancy turning them from stock. Anything you know of that's available?

[Davek0974]

Don't know anything off the shelf, might just need some 10mm rod and part some 4-5mm discs off.

[Clive S]

I like the approach to make the pre-load in the screws with two nuts.

[routercnc]

Dave,
OK, will have a look at what I could do there.

Clive,
Cheers, I don't know if this is going to work but it's worth a shot to see what happens. I'm only going to fit them to the Y axis to see how it goes. I have some spare nuts to do the X axis as well.

I have some belleville washers on order in case the spring washers don't work out. It will really come down to how much speed I loose on the steppers due to the extra load causing them to stall out earlier.

[routercnc]

Still working on the next video installment - some issues to be resolved so will be a while before ready.

In the meantime I'm working on the lower cover plate and decided it would be great to use Zeeflyboy's seals (shown fully retracted Z axis):



More to follow . . .
(Zeeflyboy - pm sent)

[routercnc]

OK, here is Episode 8 (part 1). This one is for the upper cover plates on the main housing of the Y axis. Caused some problems along the way as I don't have the proper tools for sheet metal work but got there in the end.

[Clive S]

Well, what can one say, definitely a work of art, when are you starting on the glass case