Countersinking

[frgna]

Can someone recommend a good countersinking tool(s) for the chassis so that the large and small screws will fit in perfectly flush - probably a "pairing" of countersinkers and good stainless screw set (pref black with hexes, no philips) is what I am looking for.

Thanks

[GoMachV]

Countersink bits:
Associated/losi style 8-32 aircraft screws are 100 degree
Traxxas, kyosho and other metric 4mm are 90 degree
Associated/losi style 4-40 are 82 degree

I am not a fan of the countersink bits i am using, so I'll leave that for someone else. Lots of flute designs to weed thru

I don't use stainless so I can't comment on screws.

[jwscab]

Unfortunately its not well known but the associated supplied #4 screws don't fit the chassis countersinks very well. The chassis is really too thin for the proper countersink and screw combination. If you open the chassis with an 82 degree bit, part of the screw taper will protrude above the chassis. The chassis is better suited to 100 degree #4 hardware.

[frgna]

Unfortunately its not well known but the associated supplied #4 screws don't fit the chassis countersinks very well. The chassis is really too thin for the proper countersink and screw combination. If you open the chassis with an 82 degree bit, part of the screw taper will protrude above the chassis. The chassis is better suited to 100 degree #4 hardware.

This is what I was looking for. Thank you. So it looks like I need 100 degree bit and some custom screws.

[bully]

Losi do the 8/32 screws in steel with a hex type head mate... They are black also mate

[jwscab]

If you use 100 degree #4 hardware you should be fine with the factory countersinks. I do this all the time. While it's not perfect it gets the job done. I'll take some sample photos in a little while.

[GoMachV]

Losi do the 8/32 screws in steel with a hex type head mate... They are black also mate

Those are a 82 degree if they are the same ones I got. They were an old part number for the aluminum 8/32 and arrived steel and 82 degree. I was very unhappy. They will not fit properly in the tub either

[jwscab]

OK, here are some sample pics. An 82 degree standard screw compared to a 100 degree aerospace screw, both #4 mounted into one of the stock countersunk holes in the rc10 chassis, B stamp.

the 82 degree screw would not tighten up against the chassis with just a nut, I had to add some washers to allow it to pull up tight. The 100 was snug with just the nut, but not overly so.

you can use either type on the factory countersinking without much worry.