Foam XL hot wire cutter

**Boyan Silyavski** · 29-08-2017

Well, 260euro for 6x 1300mm + 6 MGN12H, just payed it so is done.

That will not stop me buying the Delrin balls though. Just for the experiment. By the way as the guy originally designed the bearings not in parametric, i took my time yesterday to redesign them from scratch. I did not like the not squarish design. I have also some other idea about the preload and how will look at all. This is the result for the moment. More purification when i have the balls and have tested the length so the balls fit tightly and exactly

Click image for larger version.

Name: bearing block delrin 3 .PNG
Views: 408
Size: 160.5 KB
ID: 22690

**charlieuk** · 29-08-2017

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

**Boyan Silyavski** · 29-08-2017

Originally Posted by charlieuk

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

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

**charlieuk** · 05-09-2017

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** · 06-09-2017

Originally Posted by charlieuk

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** · 06-09-2017

Originally Posted by charlieuk

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** · 07-09-2017

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** · 13-09-2017

Originally Posted by Boyan Silyavski

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** · 14-09-2017

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** · 14-09-2017

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