Printable View
I ment if the 4th axis went across the machine rather than down the length. The way you have it down the length would be more ridged as the spindle would always be at one side of the gantry however maybe it would be more compact if it was the other wayQuote:
Originally Posted by JAZZCNC
Quote:
Originally Posted by JAZZCNC
Where do you have the screws for the x on this machine? just trying to think if I have the 4th on the side its going to be a little cluttered having the screw on the side and then the 4th beside and below it, not great for dust and chip protection ether. perhaps this means it would be better to be keeped inside the main frame
thinking this is already starting to look untidy
Attachment 23855
Doesnt have any it's using the "Force".!! . . . . Nah they are under the bed connected to brace running between each side. Obviously this design wouldn't work for you with high sides. But your only talking 75-100mm difference so shouldn't be big deal in grand scheme.?Quote:
Originally Posted by charlieuk
Thanks dean it does look very clean with the screws under the table, I do worry that it will over complicate the build a little but perhaps its worth it, I was going to use 100x100 for my cross members in the middle of the as I have all the stuff I got for free you use something like 50 x 50 so the screws stay hidden.Quote:
Originally Posted by JAZZCNC
Its looking like im going to build building almost exactly the same as your phone in the end except for the raised rails, bed and whatever changes to the screws and motors to get the speeds for a more metal dedicated machine but like they say imitation is the greatest compliment and why try and re invent the wheel when you have so much experience and knowledge that you share.
so going with this sort of placement I could just about get 40mm cross members above the screws unless the bk block is made smaller.
I also loose quite a lot of length with the 100mm box section on the end so wondering if there was a way I could get some of this length back? I was wondering about cutting some of the back of the box section away so the belts and pulleys are inside the box section?
Attachment 23862
few more sketches throwing ideas around.
I'm sure I missing a lot on not knowing the best way to make use of space
the first was pushing everything up underneath but makes getting to everything for servicing very hard
the second putting the screw back on the out side but underneath means chips from the 4th axis are going to be going straight onto the screw, some shielding could be provided but I would expect it still to not be great.
I guess I have to make a compromise some were and ether the machine has to be longer or the 4th bolts onto the bed
Attachment 23865
Attachment 23866
Can't be bothered going back thru all the thread but what are you wanting to mainly cut with this machine charlie.?
Its mainly cutting metel, so aluminum moulds to as good a finish as I can get are high on the priority list if it can do anything harder at any sort of speed that would be a bonus but im not really expecting it from a router.Quote:
Originally Posted by JAZZCNC
a few pics bellow of the same sort of thing I want to cut but that I have been testing in foam on my other machine and from corian on a friends when I was in auz.
Attachment 23867Attachment 23868
having not been able to find a answer I have started to make a few compromises, at the moment im thinking im going to have to add a little extra length but wondering about having the motors inside the frame perhaps to keep it tidy. having the screws underneath like it Is at the moment I have had to reduce to 100 x 40mm box section for the cross members and that only leaves 1.3mm clearance between it and the ballnut mount. im not to keen on that so thinking I need to find a little more clearance and maybe in large the cross members or go back to screws on the out side
Attachment 23885
I just didn't feel happy with the above with the screws being so close to the cross members and reducing the size of the cross members so I think back to square one and to the screw on the outside and then I was thinking I can probably bring the 4th and put on the inside of the rails and then If I ever really need to use the hole bed including the small area the 4th take up I will just have to un bolt it but having it on the side means i could have some sort of locating plate that stays fixed to the machine to aid relocation on the motor end and then then the tail stock will need to slide anyway so that should be fine.
if anyone has any comments or ideas I think I will go ahead and draw the final design.
Attachment 23890
Finally got myself a nice chop saw so I can start this build, it’s crazy how easy it goes through steel. I allso got my tig welder back sorted so quite excited :)
As the need to have the machine built to do so work I have decided to not worry about the 4th axis at the moment and just do a more basic build and just get it done.
One thing I do think may be useful was to have provisions to clamp long parts vertically so I have shortened the bed a bit to allow for this. I have to basic ideas to do the frame. the first is a lighter build using some smaller 50x50 box for the internal framing and the other uses all 100x100x5 box which I have stacks of but wondering if its just going to make it heavier than needs be for no real gain.
one of the first jobs though is to clean the surface rust of all the box section in a big vinegar bath which is going to comprise of a length of 150mm plastic pipe.
Attachment 24508Attachment 24510Attachment 24511