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[WoodKnot]

The C beam and small-sized profile is a weak link I must admit and it's testing me trying to find what I consider a suitable workaround using these profiles and the length of ball-screws etc.

I haven't even looked at the gantry and Z-axis side of things yet but I will give it a good look over and see how we can stiffen it up if needed.

I can see this turning into a Frankenstein WorkBee, Oznest, or whatever they are called...

WoodKnot's Frankenstein CNC - I like that!!

Really Jazz - it'll be alright -

Let it be! - you are making the plates and lets leave it at that - it will be what it will be.

The Z Axis is very short and on the back of the X axis there is another piece of 4020 that is fastened to the back to run the cable track on.

So, lets get the plates on and give it a go - you maybe surprised - it maybe ok?

I did say maybe!

WoodKnot

[JAZZCNC]

WoodKnot's Frankenstein CNC - I like that!!

Really Jazz - it'll be alright -

Let it be! - you are making the plates and lets leave it at that - it will be what it will be.

The Z Axis is very short and on the back of the X axis there is another piece of 4020 that is fastened to the back to run the cable track on.

So, lets get the plates on and give it a go - you maybe surprised - it maybe ok?

I did say maybe!

WoodKnot

Woodknot, I don't think you realize just what a mess this miss-match of parts puts the machine design in or the complications they cause.?

Because the size of the rails and ball-screws were never designed to fit on this frame and profile style then things have to be moved into positions that are not ideal or good.
For instance, the only way to fit the ball-screws is to now place them outwards of the gantry sides, this then leaves nothing to fasten the BK bearings onto, so we have to extend the endplates so brackets can be made which extend off at 90 degrees for the BK bearings to fasten onto.

This while not being an ideal location having the screws hanging so far off to the side can easily be done in terms of making extended plates, however, the complications are how do we allow for alignment of the screw in both horizontal and vertical alignments and the fastening of the ball-nut mount on the gantry side.? Slots in the end plates and BK plate are the answer to allow adjustment.

However, there's another issue that now the SFU mount is on the outside of the gantry which puts the SFU mounting bolts on the inside of the gantry which cannot be accessed when fastened to the linear bearings. We can't fasten the SFU bearing onto the gantry side before fitting it onto bearings because we need to align it to the ball screw.!

These are just the issues with the Y-axis and I haven't even looked at the X or Z axis but again this mismatch of parts will place similar design complications.

So maybe you can see I'm not talking about trying to design you a completely new machine that is super strong, the struggle is just making things fit together in a fashion that makes assembly possible and doesn't waste my time or yours making plates that don't work or fit.!

I know you think it's simpler than it looks but honestly it's not, however, as you have found it's very easy to F-UP which I don't intend to do.! So please say now if you want me to continue or not because I haven't got time to waste making plates which don't work.!

See pics to get some idea of the issues.

[WoodKnot]

Woodknot, I don't think you realize just what a mess this miss-match of parts puts the machine design in or the complications they cause.?

Because the size of the rails and ball-screws were never designed to fit on this frame and profile style then things have to be moved into positions that are not ideal or good.
For instance, the only way to fit the ball-screws is to now place them outwards of the gantry sides, this then leaves nothing to fasten the BK bearings onto, so we have to extend the endplates so brackets can be made which extend off at 90 degrees for the BK bearings to fasten onto.

This while not being an ideal location having the screws hanging so far off to the side can easily be done in terms of making extended plates, however, the complications are how do we allow for alignment of the screw in both horizontal and vertical alignments and the fastening of the ball-nut mount on the gantry side.? Slots in the end plates and BK plate are the answer to allow adjustment.

However, there's another issue that now the SFU mount is on the outside of the gantry which puts the SFU mounting bolts on the inside of the gantry which cannot be accessed when fastened to the linear bearings. We can't fasten the SFU bearing onto the gantry side before fitting it onto bearings because we need to align it to the ball screw.!

These are just the issues with the Y-axis and I haven't even looked at the X or Z axis but again this mismatch of parts will place similar design complications.

So maybe you can see I'm not talking about trying to design you a completely new machine that is super strong, the struggle is just making things fit together in a fashion that makes assembly possible and doesn't waste my time or yours making plates that don't work or fit.!

I know you think it's simpler than it looks but honestly it's not, however, as you have found it's very easy to F-UP which I don't intend to do.! So please say now if you want me to continue or not because I haven't got time to waste making plates which don't work.!

See pics to get some idea of the issues.

Good evening Jazz

OK, so my ballscrews will not fit inside anyway, unless I use a different style of nut?

The ballscrews are too short for the profiles, so overall a complete mess.

Is there an alternative nut and if I got screws that are longer than the profiles, could the bearings be seated in the plates?

Your thoughts please?

Thanks

WoodKnot

[JAZZCNC]

Good evening Jazz

OK, so my ballscrews will not fit inside anyway, unless I use a different style of nut?

The ballscrews are too short for the profiles, so overall a complete mess.

Is there an alternative nut and if I got screws that are longer than the profiles, could the bearings be seated in the plates?

Your thoughts please?

The choices are limited with what you have now because as I say these parts were never designed to fit together as you planned. There is no nut you can use that will fit into the space you have in that C beam profile and the location of the rails/bearings in the position you intended. (see end shot)
Even moving the rails onto the top and side orientation doesn't help much because of the type of profile.

In my opinion, your only choice is to go with something like I have shown and live with any compromises or start again with a different profile and design.!



Let me know what your thinking and I will continue with the other axis, because like I say it's not just the Y-axis which will give problems.