Foam XL hot wire cutter

[charlieuk]

that's a very good price what supplier did you use?

[Boyan Silyavski]

that's a very good price what supplier did you use?

https://www.aliexpress.com/item/6PCS...830411520.html

[charlieuk]

I started drawing my thoughts up is there any difference running the linear rails on the side rather than top of the extrusion?

[Clive S]

I started drawing my thoughts up is there any difference running the linear rails on the side rather than top of the extrusion?

I don't see any problem with that

[Boyan Silyavski]

I started drawing my thoughts up is there any difference running the linear rails on the side rather than top of the extrusion?

I think there is not absolutely any need the foam block to be supported by the structure . It could easily be simply on the floor or lifted by rests of foam. or a bed formed from foam leveled by the wire.

Same could be said for my design, but the cross bracing supports the smaller alu profile i am using against twist.

[charlieuk]

The problem comes when you have to move the blocks of polystyrene around, the blocks are not all that light and I'm dealing with 16' x 4' x 2' blocks so having a smooth and flat table to easily side them on to make it posable just about by myself were your method I probably could not. I allso will be putting mine in a 20' shed that has a wood floor so I need to build some extra strength into the design so it is self supported.

[charlieuk]

https://www.aliexpress.com/item/6PCS...830411520.html

just wondered if you had received this yet? any feed back on quality if so?

[Boyan Silyavski]

Still waiting and yesterday night started pushing them as the number they provided is not correct. Will update as soon as i know.


There is a very nice detail that 2040 and MGN12 have holes that coincide with the channel so i designed a nut for the TR10x2 screws. and a bearing plate from 2040. https://www.thingiverse.com/thing:2527055

[charlieuk]

at the moment I'm still going to go for the 80x40 10mm slot kjn aluminium, partly as all the other extrusion I have is 10mm slot so have the jigs and extras to go with it all.

with the 10mm slot I'm leaning towards the 15 or 20mm rails, 12mm doesn't give much to sit on the aluminium.

I have drawn my gantry at 40x80 also but may go for 40x40 on that.

the vertical axis I was thinking would be belt driven however I want to link the two sides together which may be easier if they were screws

I think maybe a lego mock up is needed

[Boyan Silyavski]

yes, there is absolutely no point of going with 12 size rails given the size of your extrusion. 20 size will be best. 15 size may save you some $$

i went with screws as on that length price was same, but i had to go with bigger belt, at least Hdt3 15mm wide, which would mean bigger motors, bigger drives. And at the moment i am hoping to drive all with 30 euro ramps 1.4 and drives, 4 motors 10 euros each and the DEVFoam CNc which seems best for the purpose