Scanstrut SC20/Eurospar Mast Problem.

[Ian_Rob]

Neither the feet of the Scanstrut SC20 mast mount or the adapter kit that is specifically made for Eurospar masts, actually fit the F305 profile of my Dufour 365 mast.

I am thinking about making some spacers with differently curved faces that will fit between the feet and mast to accommodate the different curvatures of the abutting surfaces. I need something that is tough and long lived (unaffected by UV) and which can be sanded to the correct profiles.

Would Delrin be suitable? Any alternative suggestions? Nylon….?

Has anybody else had this Scanstrut/Eurospar problem?

 

[[70521]]

Have you contacted Scanstrut? They are usually really helpful in sorting problems out.

 

[Ian_Rob]

Hi Sandy. I sent them the mast profile back in March 2021 and they said the SC20 would work but it doesn’t They have been looking at the problem all afternoon and now agree that with or without an adapter there is a discrepancy in the profiles. We could just rivet it and fill the gaps with mastic but I don’t want to bodge it. A curved packing or spacer should work but….??

It would be very easy to 3D print a packer but I would be concerned re life expectancy.

I must say that Scanstrut are extremely helpful. It is a problem they haven’t come across before.

 

[Ian_Rob]

….Perhaps an epoxy putty in sheet form that will conform to both surfaces and then set solid. Is there such a thing??

 

[Daverw]

You could put epoxy putty in the cut fingers of rubber gloves to make little bags, hold against mast at low level until set, remove and clean up, tidy edges, drill to suit.

 

[Ian_Rob]

You could put epoxy putty in the cut fingers of rubber gloves to make little bags, hold against mast at low level until set, remove and clean up, tidy edges, drill to suit.

Yes something along those lines. I was also thinking that I could 3D print a mould and then cast them in solid epoxy resin.

The two images (with and without the adapter) illustrate the mismatch:

I am inclined to go with the adapter (the first image) as the rivets, though not perfect, will be more perpendicular to the inside wall of the mast

 

[Ian_Rob]

I am not sure if it would compromise the overall strength but perhaps I could simply cut some neoprene rubber washers that would compress to the curvatures as the rivets are set.

 

[Ian_Rob]

Another way of solving this is to make some radiussed faced packers/washers in Acetyl (Delrin) that will fill the gaps between the feet of the mount and the mast. From my CAD drawing, they will need to be approx 7.5mm thick.

The standard pop-rivets for fixing the Scanstrut feet are 4.8 x16mm so, allowing for the packers, they would need be increased to 4.8 x 24.

Anybody happen to know if Monel rivets of this size are made? I can find 4.8 x 24 stainless ones but not Monel??