Conservation of 1913 Emblem

[moritz]

gentleman, I am looking to install a muffler and Mike Terry said that Tim Theo from Wisconsin has helped out in the past.
Does anyone have contact info for Tim Theo?
V/R Ken

[Peter Maas]

great films on youtube, seen them all

[moritz]

this is the fender bracket that I need to chase with a die rough dimension is .230 OD of the thread.
good SA on the mscdirect site.....im looking now.

just ordered 1/4-27 die from mscdirect......thanks

[T. Cotten]

Bolts will measure under, taps will measure over. Over will vary depending on the 'H' # of the tap.

I stand corrected, BLB, Thanks!

It would be nice to see the part...

....Cotten

[BigLakeBob]

A caliper on a tap or bolt will always be shy of the nominal size,



....Cotten

Bolts will measure under, taps will measure over. Over will vary depending on the 'H' # of the tap.

[T. Cotten]

I had the flare nuts and nipples manufactured locally, I got lucky.
im still looking for tap & die to chase what looks to be .230 OD thread 27tpi again....
any suggestions would be appreciated.

I'm confused, Ken!

(Its easy.) Can you show us this quarter-inch part?

A caliper on a tap or bolt will always be shy of the nominal size, so I might wonder if its https://www.mscdirect.com/product/details/74840265

But you never know...

....Cotten

[moritz]

I had the flare nuts and nipples manufactured locally, I got lucky.
im still looking for tap & die to chase what looks to be .230 OD thread 27tpi again....
any suggestions would be appreciated.

[chuckthebeatertruck]

to clear this up, the early editions of machinery’s handbook do list 7/16-27 UNS, It is a common thread size for brass piping, and yes originally from an obsolete british pipe standard. Per those editions, all brass gas pipe is threaded 27tpi regardless of diameter. this is in reference to both straight and tapered threads.

because of constant updates, the 2nd and 22nd editions of most reference books will contain different information, and often the stuff we need to reverse engineer is found only in the early editions. i snap up prewar reference books when ever possible.

i “learned” there were “different” threads when i worked on my first bike with pre-war british cycle threads. until then i hadn’t seen them in my life and was super confused. bsc is the 26tpi thread referenced above. Loads of high quality bits can be had from uk specialists.

a great summary of all the threads used on early bikes can be found in Radco’s Vintage Motorcyclists Workshop book. pdfs are floating around.

[RichO]

Moritz, If you send me a PM with your mailing address I will send you some period Emblem stationary. Rich O.

[exeric]

I've used 1/8 NPS x 27 t.p.i. taps and again, it wouldn't surprise me that a manufacturer would produce those plumbing sizes. My Merkel uses1/4, 5/16, and 3/8 x 26 t.p.i.nuts and bolts in odd places. I found a source for those taps from a company in India and they are of decent quality. Couldn't find those sizes in the U.S. or should I say, I'm too cheap to pay the price for specialty taps

[T. Cotten]

I know my replies sound snarky, but that's not my intention. In regards to your thread size of 7/16 x 27; I have never heard of that size, and it isn't listed in the Machinist's Handbook which means it isn't an industry standard. There is a 7/16 x 28 which is called 'extra fine'. . . 20 t.p.i. being fine thread. If your male, and female thread are indeed 27 t.p.i. they will have to be single pointed in a lathe as there is no standard, or special tap, and die of that size. I would not be surprised if your fittings are 27 t.p.i. as manufacturers are notorious for making fittings, and fasteners so weird that you have to buy from them.

Snarky belongs to me, Eric!

I first encountered 7/16"-27 straight thread working for the guv'ment, and was taught it was British pipe thread. But it is common for American motorcycle carburetors.

Taps and dies are readily available from MSC, etc.

Mr. Fickau also has 24tpi nuts; Must have been for Indians, because I sold out.

....Cotten

[exeric]

I know my replies sound snarky, but that's not my intention. In regards to your thread size of 7/16 x 27; I have never heard of that size, and it isn't listed in the Machinist's Handbook which means it isn't an industry standard. There is a 7/16 x 28 which is called 'extra fine'. . . 20 t.p.i. being fine thread. If your male, and female thread are indeed 27 t.p.i. they will have to be single pointed in a lathe as there is no standard, or special tap, and die of that size. I would not be surprised if your fittings are 27 t.p.i. as manufacturers are notorious for making fittings, and fasteners so weird that you have to buy from them.

[T. Cotten]

For the nut, Ken,

I just opened up a 62361-50 out of most catalogs with 5/16" drill for the ferrule. They are usually cad, though...

More correct profile nuts, and ferrules, are available from fickauprototypes@cs.com

....Cotten

[moritz]

Cotten thank you for the response.
I have the 7/16 -27 nut being locally mfg with nipple.
this should resolve my fuel and oil line issue.
thank you.

[T. Cotten]

My best guess since I found your previous post, Ken,

image_36038.jpg

It might be 1/8"npt on top, and 7/16"-27tpi straight thread for the nut.
The ferrule is unique in that it is radius'd rather than beveled like most

Assuming your tanks have been cleaned thoroughly, pump fuels these days are relatively clean, so any fouling in the carb would most likely be a disintegrating air valve or float.

Most of us would clean and dress the original hardware, and use it.

....Cotten