Yes, that is another thing I have always done, ever since the first time I
struggled with getting bolts and holes aligned. Never again, just drop the
rotor into the holes and put the nuts & washers on.
Jim Rhodes
K0XU
On Mon, Dec 3, 2018, 14:47 Mike Lucas <w5chr@bellsouth.net wrote:
>
> When rebuilding a Ham-M style rotor, studs can be used in place
> of the 1/4-20 bolts from the factory. There is room to increase the size
> to 5/16-18, and to use a better grade material at the same time.
> Grainger sells a bag of 10 pieces of 5/16-18 type 316SS studs at a
> reasonable price. Grainger part number 21 YN26. Drill the (4) bolt
> holes to 1/4 inch, to the bottom of the hole. Tap the re-drilled holes
> to 5/16-18 thread. Use a suitable lube when drilling and tapping.
> Kerosene is usually the choice of us older machinists.
> Clean the gorp out of the threaded holes. Install the studs to
> the bottom of the tapped hole. Two 5/16 nuts jammed together will allow
> the stud to be bottomed out in the threads. Use Loctite on the stud end
> in the rotor housing only, nowhere else. Un-jam the two nuts used to
> install the stud, and tighten the bottom nut against the case for a jam
> nut.
> Repeat the above for three other studs. Be careful where the
> Loctite is used!.
>
> With the case turned to it's upright , normal position, use a
> combination of nuts and flat washers to mount the rotor to the tower
> plate. By using the full four inch length of the studs, the bottom
> surface of the case will be about 2-1/2 inches above the rotor plate.
> From the top down, the sequence is : (1) nut (2) nut (3) flat
> washer (4)rotor plate (5) flat washer (6) nut (7) nut. If regular low
> carbon nuts are used, they won't gall on the stud. With the rotor
> elevated, the cable is easily routed, the rotor can be lowered for
> clearance to slip it out of the mast, all sorts of good things. Jam
> nuts keep everything where it belongs. This is a quick and dirty how-to,
> but it works. I have installed studs in a rotor mounted in a TX455
> standing upright.
>
> Mike W5CHR
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