Collins PTO tool

[W4NEQ]

I'm still polishing on my Collins 75A3.  My PTO endpoints are out 9.5 kc end to end, an it seems clear that I'm going to have to pull the PTO to do the adjustment.  Despite impossible clearances, I managed to get the spread adjuster plug out,  but now I'm going to have to fabricate a tube shaped special screwdriver to loosen the adjuster slug locknut before I can see if I can tweak it in.  And that's after I find some 4 spline bristol wrenches for the PTO shaft coupler setscrews ...

My question:  I've seen references to published machinist drawings of this tool supposedly in Electric radio.  Does anybody know the dimensions or have the drawing?

Chris

[W4NEQ]

Following up on my own earlier inquiry, I've been helping Emil, WD4SCZ with his Collins 51J? receiver, which is quite similar to my 75A3.  It seems every one of these needs the endpoints on the PTO readjusted, and aside from Bristol wrenches, the critical tool is the one for the locking collar on the adjustment slug screw.  

If you've been there, done that, you know what I'm talking about.  When you are first confronted with this often glossed-over detail, you'll wonder how you're supposed to turn that!  Emil found a drawing for the tool, and here it is.

These tools appear to be scarce, but one can be made with a lathe.  The metal is not specified, but brass might be best.

If you don't need the 5/8" "knob" at the end, start with 1/4" rod, face, then center drill the end using the tailstock.  Then swap to a #29 drill bit   (0.136") and drill it full depth.  Then turn the body down to 0.200" - remove from lathe and either mill or file the two engagement points.  Seems like the CCA would have these for sale or rent, but I guess it doesn't come up that often.

Chris

Edited to explain using 1/4" rod.

[KM1H]

They were part of the R-388 tool set along with the Bristol wrench and under the top cover.

Carl

[WD4SCZ]

They were part of the R-388 tool set along with the Bristol wrench and under the top cover.

Carl

A previous owner of this particular R-388, not only sawed of the sides of the front face that allowed the radio to be rack mounted, he cut off the handles, removed the military dataplates, and did away with all the tools, and the spare fuses normally stashed under the top cover.

He should have his bag nailed to a stump and be pushed over backwards.

[KM1H]

OOOUCH, I can feel his pain from here.  While I dont have any close stumps I do have a 12 gauge that could be used in a certain orfice if that was my radio

[W1ATR]

They were part of the R-388 tool set along with the Bristol wrench and under the top cover.

Carl

A previous owner of this particular R-388, not only sawed of the sides of the front face that allowed the radio to be rack mounted, he cut off the handles, removed the military dataplates, and did away with all the tools, and the spare fuses normally stashed under the top cover.

He should have his bag nailed to a stump and be pushed over backwards.

How about nailed to a chair, set the room on fire, and throw him a butter knife. 

[Dave K6XYZ]

Following up on my own earlier inquiry, I've been helping Emil, WD4SCZ with his Collins 51J? receiver, which is quite similar to my 75A3.  It seems every one of these needs the endpoints on the PTO readjusted, and aside from Bristol wrenches, the critical tool is the one for the locking collar on the adjustment slug screw.  

If you've been there, done that, you know what I'm talking about.  When you are first confronted with this often glossed-over detail, you'll wonder how you're supposed to turn that!  Emil found a drawing for the tool, and here it is.

These tools appear to be scarce, but one can be made with a lathe.  The metal is not specified, but brass might be best.

If you don't need the 5/8" "knob" at the end, start with 1/4" rod, face, then center drill the end using the tailstock.  Then swap to a #29 drill bit   (0.136") and drill it full depth.  Then turn the body down to 0.200" - remove from lathe and either mill or file the two engagement points.  Seems like the CCA would have these for sale or rent, but I guess it doesn't come up that often.

Chris

Edited to explain using 1/4" rod.

A small circlip pliers might do the trick.

[Todd, KA1KAQ]

I don't have the link handy, but someone actually makes reproductions of the 51J/R-388 alignment tools for $15 each I think. Was planning to get a set to send to the UK but ended up finding a nice R-388 complete with all its tools, covers and tags. Even has a good filter cap in it now. 

[WD4SCZ]

...someone actually makes reproductions of the 51J/R-388 alignment tools for $15 each ...

Those are the phenolic tools for aligning the coils and trimmer caps that are being reproduced.

http://www.kitparts.com/Alignment.html