[adam_m]

I've been reading a lot of the threads on dust shoe design and brush recommendations and wanted some feedback on what I think will work or if there are other recommendations for brush material.

McMaster has the following items that look appealing...

7442T12 - Stainless Steel-Backed Polyester Conveyor Strip Brush, 3/16" Wide x 7/32" High Backing, 2" Overall Height, 3' Long, .012, nylon
7442T13 - Stainless Steel-Backed Polyester Conveyor Strip Brush, 3/16" Wide x 7/32" High Backing, 3" Overall Height, 3' Long, .020, nylon
74405T9 - Galvanized Steel-Backed Nylon Conveyor Strip Brush, 3/16" Wide x 7/32" High Backing, 4" High x 3' Overall Length, .014, nylon

Is horsehair to fine for general purpose work? and what about bounce back or resistance on the Z axis from the brush does that play a roll in selecting the correct thickness?

Thanks for any suggestions or feedback.

Adam,

[adam_m]

Tough crowd.. no suggestions or recommendations.. hmmm

[baskarz]

I ended up stripping a cheap dustpan and brush set of its bristles and glued them into my dust shoe (1/8" slot) and they worked very well.
In terms of bounceback or resistance, the dustbrushes bristles performed well. Their thickness didn't seem to have any effect on the Z, if anything it helped hold down thin mdf while cutting and helped with bowing of thin materials.
I did look at different bristle material on different brushes and brooms and came to the conclusion the cheap dustpan brushes felt firm enough to work well and soft enough to not interfere with the z travel (no missed steps)
Hope that helps in your brush selection, i just went the budget route :-)

So i have been running this shoe for about 6 months now and worked great until i left the dust shoe on while milling aluminium and now the bristles are caked in crc soaked ally filings :-p
Lesson learnt, take it off before milling ally with crc as coolant, now i need to redo my bristles as the crc got between the hot glue I used to glue the bristles in and now its all falling apart.
Next time around i will probably use something along the lines of kwik-grip or a silicon type adhesive.
You can see in the first pic where the hot glue is lifting away.
Attachment 237966Attachment 237968Attachment 237970

[nekidfrog]

I ordered McMaster-Carr this. As the plastic housing was better. However I have not yet attached it to my dustboot as cnc is under reconstruction again.

[ger21]

I think I used the 5/16"x4"
Imo, you want the bottom of the brush to be slightly lower than the end of the bit. This can cause problems if you use both really long and really short bits. I use a 3/4" spacer to lower my brush with longer bits.

[adam_m]

Thanks guys for the posts.. I guess this will turn into a trial and error setup.

I'll try to post back my successes and avoid the failures. ;-)

Adam,

[plcamp]

I think I used the 5/16"x4"
Imo, you want the bottom of the brush to be slightly lower than the end of the bit. This can cause problems if you use both really long and really short bits. I use a 3/4" spacer to lower my brush with longer bits.

Gerry, this is a bit off topic but it is still applicable to the dustshoe. Do you experience any static electricity from your dustshoe dragging around and if so how do you dissipate it?

plcamp

[ger21]

No, not that I've noticed.