attn. SCR-193 crowd

Radio Telephone and Telegraph Transmitting and Receiving Equipment
brian in denver
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attn. SCR-193 crowd

Post by brian in denver » Sat Aug 05, 2017 10:56 am

we need measurements for the 90 Deg. bracket that engages the FT-172 rod. kinda looks like a 1 inch piece of angle aluminum ?
http://www.radionerds.com/index.php/FT-172
tanks
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wa5cab
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Re: attn. SCR-193 crowd

Post by wa5cab » Mon Aug 14, 2017 12:24 pm

Brian,

Several years ago, I had some of these made. Unfortunately, half are about 3/16" too short and the other half about 1/8" too tall. However, either one will still work. There is also a steel reinforcing plate for the top of either the BC-191 or BC-223. The shock mount (Lord 150PH12) is the same size as the shocks on the FT-151 except that those are not threaded 1/4"-20 thru. FT-172 is same as FT-178 except no reinforcing plate, shock is Lord 150PH6, and BC-312 takes two sets instead of only one on BC-191.

The angle brackets are made from steel flat bar. And the reinforcing plate is also steel. I never got around to painting them. Both originals I've had were strangely enough painted white. I also never made the threaded rods. As best I can tell, the rods are 12" long, threaded 1/4"-20 x 1" on rear end and and 1/4"-20 x 2" on front. Mounting hardware is #8-32 flat head machine screws, nuts and split lock washers. If you only need a few, I'll take $10 per pair for one to five (no mounting hardware), and I would play it safe and use the slightly too tall ones. Installation calls for one 1-4"-20 hex nut at the shock mount and two 1/4"-20 wing nuts and two 1/4" flat washers at the angle bracket.
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Re: attn. SCR-193 crowd

Post by brian in denver » Mon Aug 14, 2017 12:49 pm

I think the wingnuts might be a problem, modern ones have huge rabbit ears, or the other kind micky mouse ears. both I think have clearance issues
that the old butterfly ear didnt have. (the kind shown in the drawing)
we bought the lord rubbers. they were out of the one kind.
on the carryall table the BC-312 just gets one.
I think we have a sample of the reinforcing plate.
good to know there steel. instead of AL. I was just going to chop 1" angle iron to a 1" chunk. ( although in some pics it only looks 3/4" wide) drill it and slot it.

thanks
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Re: attn. SCR-193 crowd

Post by wa5cab » Mon Aug 14, 2017 3:07 pm

It all depends upon where you buy the wing nuts. Cheap Chinese ones are usually fatter, probably to make up for low grade steel. Or maybe for fatter fingers??

Ordinary steel angle won't work satisfactorily because the two inner surfaces are not parallel to the two outer ones. Plus unless you spend a lot of time on the mill, the parts will not look like the originals. If it's worth doing, it's worth doing right. The flat bar used was 1" x 3/16" nominal. The reinforcing plates were made from 1/8" nominal plate (I forget what gauge that equates to.
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Re: attn. SCR-193 crowd

Post by N6FEG » Tue Aug 15, 2017 5:23 am

I'm mailing out to Brian a dwg I made of the bracket. The dimensions were taken from a single bracket that was still on a BC 312 case I had.
The dimension on the height of the vertical p/o the bracket I had looks to be 1/8th" taller than what I could derive from a dwg showing the installation of the FT 172 , FT 178 showing the bracket. Also the thickness of the bracket on mine was 1/8th" and the dwg looked to be 1/4" thk.

The brackets I ended up making were made from the dimensions taken from the bracket I had and not from the dwg in the TM 11-2715. I made mine from aluminum and not steel as the one bracket I had was made from steel.
Mine were used on the restoration of the SCR 499 radio and worked just fine.

And Brian the dwg is going out in todays mail so you should have it by this weekend.

Paul
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Re: attn. SCR-193 crowd

Post by brian in denver » Tue Aug 15, 2017 8:26 am

thanks , I think Ill buy a couple of the CABs to, so I can cop a feel. do you have a wingnut you guys prefer, cuz after an hour of surfing, the interweb I only found the same chinese one.

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Re: attn. SCR-193 crowd

Post by brian in denver » Mon Aug 21, 2017 7:37 am

just for giggles Ill expand this thread with some links.

viewtopic.php?f=56&t=251701&start=540
and
https://g503.com/forums/viewtopic.php?f=36&t=218679

this is our carryall so far.
http://www.radionerds.com/index.php/FM-43

havent got the tall "L" brackets made yet, but we mounted the dyno, after our motor guy went through it. he recommended we use #4 fine stranded welding wire from the battery box. and to make sure the engine is running if we transmit. baby sucks some juice.

BB
Last edited by brian in denver on Mon Aug 21, 2017 8:47 am, edited 1 time in total.
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Re: attn. SCR-193 crowd

Post by wa5cab » Mon Aug 21, 2017 8:08 am

On the subject of wingnuts for the 1/4"-20 stud, P/O FT-172 and FT-178, McMaster part # 90866A029 looks like it will work OK. The only issue will be that the screws for mounting the "L" bracket and (on BC-191 only) the reinforcing plate must be the correct length and head type. Which means that the four on the BC-312 are 1/8" shorter than the four on the BC-191. And of course are not flat head.
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Re: attn. SCR-193 crowd

Post by brian in denver » Mon Aug 21, 2017 8:33 am

thanks that was driving me nuts, so to speak

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Re: attn. SCR-193 crowd

Post by wa5cab » Mon Aug 21, 2017 9:02 am

:lol:
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Re: attn. SCR-193 crowd

Post by brian in denver » Sat Aug 26, 2017 7:45 am

got the tall L brackets made and installed yesterday, cant really tell from the drawing which way they face, so installed them with the foot facing front. this way the threaded rod needs to be cut at 9 1/2 inches, to the front of the radio.

http://www.radionerds.com/index.php/FM-43

not sure why the wiki flipped the picture. but if you keep clicking on the pic it will right it, and enlarge it.

the BC-191 still sways a bit. even with the 1/4 inch flat bar. but at least it wont tear out of the mount.
keeping it strac here boss
I hate aquaphobic horses ;)

brian in denver
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Re: attn. SCR-193 crowd

Post by brian in denver » Tue Aug 29, 2017 2:18 pm

well the wingnuts look good in the drawing, and will probably clear. but there still the goofy looking rabbit ear. question now is what do I do with the other 96 :lol:

also had a heck of a time threading the hardware store rod. our gunsmith says its because of the sloppy way they harden it. it has a bunch of soft spots
that make it go every which direction.


BB
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wa5cab
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Re: attn. SCR-193 crowd

Post by wa5cab » Wed Aug 30, 2017 11:14 pm

Well, if you drive the vehicle much and don't use Locktite, you'll lose about one a year per mount. So you only have a 33 year supply. 8) The shape looks fine to me. Besides, it's not nice to disparage rabbits. :P

I'm still waiting for the height dimension on the two brackets that I sent you.

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Re: attn. SCR-193 crowd

Post by brian in denver » Thu Aug 31, 2017 6:28 am

russ sent you an email, looks like 1 1/2" tall. kinda thot they might loosen up. might lock tight the back one and see if that helps.

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Re: attn. SCR-193 crowd

Post by wa5cab » Fri Sep 01, 2017 3:39 pm

OK. 1-1/2" is the same as the 7 that I have left, which is good. Except that if means my memory isn't what it once was. Mail service is still spotty. Local delivery is back to normal but not much mail is getting into Houston for them to deliver. I went to the PO this morning and was assured that all mail leaves the local location each night. But that just means that it goes up to North Houston. She didn't know the situation beyond there, except that she did know that no First Class Mail has come into the city since the storm hit. Both airports were closed and last I heard were still on limited access other than for Military and relief related. I am going to give them until Tuesday before I start shipping anything again.

Be sure that you only use Locktite Screw Lock (normally blue). Stud Lock (red) would not be removable without a torch.

I am slowly catching up with email. I think that Russ's is next in the que.
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