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Messages - Metziii

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1
British Bikes / Re: AMAC carburetor
« on: July 07, 2015, 07:27:19 AM »
Electroplating could be an opportunity to restore fittings. But it depends on the necessary layer thickness if it can be made or not. The problem with electroplating is you will always add more nickel at the edges than to a surface area. during the nickel process surface condition change! Adding heavy nickel (more than 0.2mm = 0.0078") on a shiny polished surface it appears like sand blasted.
the parts I´ve done in the past were electroless nickel plated with 315 µin high phos + 120 µin low phos nickel. That´s enough for a corrosion resistant surface.
If the layer is to thick the nickel will peel off (at the edges first)
I don´t think the bonding will be good enough do mill it or put it on the lathe. probably grinding...
My biggest concern would be to get flakes of nickel into the engine when it peels off after a few years.

At work we use hardcrome to restore oversized shotgun chambers to get them back in tolerance. Layer thickness can be made up to 0.02" if necessary but machine it after is a pain in .....

2
British Bikes / Re: AMAC carburetor
« on: July 02, 2015, 12:42:41 PM »
Before asking again a little explanation first:
I only have basic knowlege in that "motor stuff" and what comes with it. But with a little thinking about everything I get in easy. But with every part which goes through my hands things are getting worse the guy who owned my Horex before shouldn´d own anything tecnical...
That´s why maybe some of my questions sound stupid because I am not able to copy or look at something which is done or work as it should. I am glad for every little advise.
Have the oportunity to use CNC milling and turning machines, wire cutting, Zeiss measuring machine.... Everything to draw (Solid Edge) and build a complete motor from scratch. Sometimes it´s all about the little things...

back to the interesting stuff:

I am thinking about to redo the inner guide, too. But will try to do the slide first and have a go. The guide ribs are way too narrow for the slots in the slide. Will cutout the main body for a perfect fit so a new slide has to be made anyway. I don´t wan´t to make a new jetblock thats why the cutting won´t go all the way throuh the carb. It looks like somebody has done it before but not concentric to the jetblock.
Is there a need for the same tight fit at the inside of the slide? In this case I have to cut a lot more material
Sorry for asking again...  :P
Try to get it right the first time

Cheers

Martin

3
British Bikes / Re: AMAC carburetor
« on: June 29, 2015, 01:33:44 PM »
The slide will be the next step.
thanks for mention it. Tried to find out in the past how much clearance is still ok and when it is worn out.
will check that, too.
But I guess this has to be done. My slide is made of aluminum not brass. Aren´t they originally made of brass as the body?

Cheers  Martin

4
British Bikes / Re: AMAC carburetor
« on: June 29, 2015, 06:33:44 AM »
Hi Leon,

24G = 24tpi. That´s what´s on my thread gauge...
1 3/8" helps a lot. Will try that but have to fix the lathe first  >:(

@ John
the other thread at the top looks a lot better than at the bottom. It´s just at the pic.
I don´t like to solder it because it has been soldered once. That´s enough. To keep everythinig original is quite important for me but cheating a little with the material. Well.... 8)  ::)

Thanks to everybody for the support will post the result after production

Martin

5
British Bikes / Re: AMAC carburetor
« on: June 26, 2015, 06:58:54 AM »
@ mini-me: yes, my original part has a crack so it´s not possible to tight it up as it should be...
but I am not looking for original spare parts, all the parts I make are made of stainless. after having them nickel plated it does´t matter 8)

@ Leon: I already did. The tread seems to be tapered but in my opinion this shouln´t be. Got everything set at the milling machine just try to get it right at the first time. the lead looks like a 24G 3/16 7/32

Cheers Martin

6
British Bikes / AMAC carburetor
« on: June 25, 2015, 01:30:35 PM »
Hello everybody,

I own a "not british" 1928 Horex S500. But it has a Sturmey & Archer engine with a AMAC 6/011 Carb. Hope I got the right place for my post anyway...
The thing is I can´t get the engine running properly. That´s why I´ve started to rebuid all parts that may affect the performance.
Now I need some help with a thread. Does anybody know the dimentions of the thread marked at the pic?!

thanks in advance!

Martin

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