Topic: How is this for being a smart ass?

[Markcb750]

This is a note sent to someone selling a O-ring chain and sprockets on eBay.


Dear ****part+++guy,

Can you provide some technical specifications on your sprockets?

Is the front sprocket ID/OD broached and hardened? if so hardened by what process, What is the surface hardness vs core?
(I can make a good guess if steel SAE identification and hardening process are known.)


Same questions for the rear sprocket.

What is the total indicator runout (TIR) of the front sprocket to the spline guide surface?


What is the nominal and maximum expected clearance on the spline mating surface?

Your supplier/manufacture should have this data available.

I do not want any components made by Chinese Harley Davidson suppliers...


Think I will get a response?

I just cant help myself.

[FunJimmy]

Mark

I think you're on your own.
Those questions are even too hard for me and I'm interested in that kinda stuff.
Post his response if you get one.

Cheers
FJ

[333]

My guess is that this will be totally ignored.

[Sam Green Racing]

.

[medic09]

I like it.

I didn't understand a single word that you said, but I like it.

It won't even get an answer, though.

[Soos]

No way he will even know what you are talking about....

T.I.R.... you are asking (99% sure) a non-machinist/engineer a question on the T.I.R. of the front sprocket to the spline guide surface?


You're too funny!!

If he answers, let us know...
And how funny the answer is!


l8r

[Steve F]

     My guess is he could reply with just about any answer, and he would be betting that you wouldn't have any way of verifying what he said.  Unless of course you have all the indicators, hardness checkers and gauges.
But yeah, you probably won't hear a word from him.

[Markcb750]

It just so happens that I have a hardness tester, several dial indicators, a granite flat, and an assortment of ground pins and V blocks...  Plus I have my mechanical design reference guide to give me all the pertinent data for an ideal sprocket tooth! 

This is just my way of poking a sales man.  Not the most humane fun, picking on ethically challenged individuals, but still fun.  And who knows, the dude may be a true "wrench" and know what I am talking about.


Mostly I just don't want Chinese/Indian chain and components  Japan still makes good parts, and I am sure Morse still makes chain, but not in Ithaca NY.

[ColinMc]

If I was that seller I would post that e-mail on the forums i'm on and show everyone my awesome made up answers in response lol.

[Uncle Ernie]

I have a feeling no one at the 3 major japanese chain manufacturers (who I'm told are all related) could tell you that stuff, either.  You could have just asked who made the chain.

You're dog bit you that morning, or are you generally a pleasant person brimming over with love of his fellow man?

[Rocking-M]

I nominate you for smart ass of the week, or month.

So I'm hereby asking all you fellows shouldn't we set up such
an award? 

[Uncle Ernie]

Clever gambit, that-
The altruistic appearance of suggesting an award for someone else while actually putting yourself at the top of the list of nominees.

[Rocking-M]

Clever gambit, that-
The altruistic appearance of suggesting an award for someone else while actually putting yourself at the top of the list of nominees.

ssssssshhhhaaaaaaa

[Markcb750]

I have a feeling no one at the 3 major japanese chain manufacturers (who I'm told are all related) could tell you that stuff, either.  You could have just asked who made the chain.

You're dog bit you that morning, or are you generally a pleasant person brimming over with love of his fellow man?

No dog could tolerate me...


I would bet you a '69 zero miles, CB750K that every major and every minor Japanese chain and sprocket manufacture could answer those questions in excruciating detail.

So could the Chinese, I just would not believe the commie bastards...


I am one of the nicest people you where ever meet BTW!

[Markcb750]

This was the answer...


"The sprockets will be either JT or Parts Unlimited brand steel sprockets."

a salesman's answer...

Why should I buy from him if I have to go other places to make sure what I am buying is better then I have?

[tramp]

no reply is going to happen
most people don't have that info

[Markcb750]

Every sprocket manufacture I have looked at on the internet, and common wholesalers like McMaster Carr list the core material and the heat treatment type.

From past experience I know McMaster Carr will provide me manufacturing tolerances if I ask.

The issue I am making fun of here is: someone on eBay offering to sell me new parts for my precious (to me) CB750, yet cannot reassure me that the product he is offering is not made by communists, or assure me it was made to some reasonable manufacturing standard.  Who buys from people like this?

Do You? 

Despite the fifty dollar savings I will buy sprockets from Indiana Honda, I will know I am receiving parts equal to or better than the ones I am replacing.  I will go somewhere local, hold the chain in my hands, put on my +2.5's and read who made it and where.  If I don't know it to be good chain, I will ask and or look on the net for information before I buy.


I bought this chain for my 1971 CB500Four in 1973

http://www.diamondchain.com/products/pro_motorcyclechain.php



And as the Leghorn says.."it's a joke son". Y'all need to lighten up.

[Rocking-M]

Buy from Rebel Gear in Tennessee. They're great to deal with and they make it.

[Markcb750]

Buy from Rebel Gear in Tennessee. They're great to deal with and they make it.

Thanks I'll look into them.

Thanks for the nomination, I work hard at being a smart ass, I feel I do as good or better job at it than any other ass I know.  Most of the time I think I am in fact a perfect ass...

Vote for me....








Wait a second, critical review of my position on giving wall street pickpockets fresh pockets to pick is critical to the nation of smart ass. I here by suspend my campaign...

[754]

sounds like you are  near readfy to make your own!!

Will you be using topping or semi-topping hobs when you cut the teeth?

I had a hobbing machine , but sold it to a guy who was making bike sprockets.. he cut a 51 tooth stainless one for us out of a blank I prepared.. bike had 4 brake calipers on it..

[Markcb750]

Although I designed, re-manufactured, and built CNC machine tools for decades, I did not set up myself with a nice Monarch lathe, or a Bridgeport milling machine with an indexing table and digital read outs...As much as I have tried to convince myself I need to buy them now, I do not think it would be a long term source of entertainment, I would have more fun with another SOHC Four, I can then harass eBay sellers for parts. Just ask smart ass questions.


I have found some really good guys out there, some of them know what they are selling.

I am experienced  with buying and manufacturing power train components. I know what difference a few thousands of an inch can make to operational smoothness and life of the system.


I have never heard the term "topping" or "semi-topping" used before in a tooth generating process.  I have used the terms ID finish, OD finish, Pitch, Pitch line, OD relief, Id relief, pitch diameter, bottom clearance, tooth profile, contact angle, lead relief, bottom relief, bottom clearance, AGMA quality number,  hob harden and lap, hob harden and grind, hob and harden...I could drag out one of my old prints and be reminded of more.

I have drawn gear tooth profiles in excruciating detail to insure the gears we put in spindle drive trains ran smooth enough to allow a precision bore to be created...

Three of the machines we designed  (I did the spindle power train) bore the connecting rods on that POS Harley Davidson V Twin, or at least they did in 1990.  HD rods are probably made by communist slaves now...but who cares, besides me? I would not own one. 


But I digress;
When shaping the tooth profile for a chain sprocket what effect does a topping or semi-toping hob have?