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Sanding stick

by workshopbob, published

Sanding stick by workshopbob Apr 20, 2017
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Sanding stick by workshopbob is licensed under the Creative Commons - Attribution license.

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54189Views 10281Downloads Found in R/C Vehicles

Summary

These sanding sticks hold replaceable sandpaper, glasspaper, ali oxide paper etc. They are 20mm wide and 150mm long. They need paper 20mm x approx. 280mm long, it varies in length slightly between sticks. The paper is easily to replace with the thumbscrews and clamp. The photos show 3 of them, I've just added a 4th which is No2 with a square end. There's a hole in one end of each of them to hang them up, it also reduces material costs.
You will need two M5 hex head bolts with a thread length of 20mm along with 2 washers and M5 nuts to match for each stick. The hex head bolts are recessed in the stick as are the nuts in the thumbscrews. I had to clean out the 5mm holes with a drill bit to allow the threaded portion of the bolt to slide through cleanly. I colour coded my thumbscrews for different grades of paper.
The sticks are printed on their side the way they are shown. All the printing was done with PLA at a layer height of 0.2mm. The sticks and clamp are printed at 50% fill and the thumbscrews at 100%.
Update 23/4/17 - Following several requests I've expanded the sticks to be 30mm wide and added the files on here. They aren't tested but should work ok.
Update 26/4/17 - Just added Stick 5. A much more one sided stick with a long thin end and a modified clamp, the clamp has one narrow end, easier to get into the harder to reach places. Stick 5 is 20mm wide and also a 30mm wide version for those using wider paper. They all use the same thumbwheels to tighten the paper down.
Update 30/4/17 - Just when you think you're finished with them you realise it's too wide to fit in where you want it ... So here's Stick 6 - This is a redesign to make it smaller. It uses M4 x 20 hex head bolts (with 20mm of thread) along with matching M4 nuts and washers. The stick is 150mm long like the others but 10mm wide and uses it's own thinner clamp and nut spinners for the M4 nuts. It obviously uses 10mm wide paper. If the nut spinner doesn't tighten up in line with the stick then move the M4 nut through 60deg until it does.

Print Settings

Rafts:

No

Supports:

No

Resolution:

0.2mm

Infill:

50% for sticks & clamps - 100% for thumbscrews

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Comments deleted.

Be very wary with the link shown as I was unable to leave the page!!!

" They are 20mm wide and 150m long."
Oh wow. I'm not sure my printer can handle that! ;)

It was a special request for large scale models :o)

Good design for a great tool. I have made #5 and already using it in my woodwork. I plan to make a whole set and use your tip to use different colour filament for the thumbwheels.

Actually the hole in the ends for hanging probably increase material cost. You're removing lower density infill to add probably pretty thick top, bottom and side walls including pre-wall support infill and that probably comes to more material than no hole+infill. The hole is a good idea but that's false advertising.

To find out if you are correct I have taken one of my designs and removed the hole then run both versions through Cura at 50% fill. Cura tells me how much filament I would expect to use on a print. The design with the hole is expected to use 8.28m whereas the one without the hole is expected to use 8.4m. It would seem that I am correct.

Fair enough, though it does depend on a lot of factors. Did you use one of the widest? At that point the hole surface area is much greater than the surface area of the ends (which is what would print if there was no hole).
It also depends on your infill percentage. At 50% you’re using a significant amount. As infill isn’t as important to part strength as walls, I tend to print 3 perimeters, 4 top and bottom and 25-35% infill. In this case I expect it will swing towards a loss instead of a gain.

My tests were done on a 20mm wide one although having tried it again with a 30mm wide and a 10mm wide I'm getting essentially the same results. I dropped the fill to around 26% and the results balanced out, increase the fill and the difference increases but then change other parameters and .... I think it's more a case of 'How long is a piece of string?' . As you say there are a lot of factors to take into consideration.

Very true, sorry for the negative comment.

You may increase the hole diameter in the thumbwheel up to 5.2mm. The tolerances of 3D Printers could make it hard to get the screws fitting in there. Mine came out in 4.8 with a 0.4 nozzle.

these will come in very handy. thanks alot.

Super Cool . Thanks for sharing . Will definitely print a few.

Such a good idea! I need to print one of those thin sanding sticks. nice work

Just GREAT and truly useful.Thanks

joel from 3dprintingnerd and bill from punished props sent me here :) ill replace the old sanding block and wedge ive been using.

just what i needed. awesome project, thank you for the effort

Many thanks, been meaning to design something like this but never got around to it, now you saved me the trouble!

HI,

can you provide the source files .. like scad?

My sanding paper is 30mm and i have some other ideas to try ..

thanks and best regards
smuk :-)

I've expanded the sticks to be 30mm wide and added the files on here. Hope they work ok

Thanks for this ,,,,,,stevep

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