rod/piston connecting

Im a fitter turner as well operating cnc and nothing is too small!grind a b/bar out of a piece of hss and hold it in a collet if you dont have a b/bar small enough or a 'u'drill (ie a tap if you have no round hss). and g40/g41/g42 becomes your friend when writing in iso!Cheers Troy.

chris74100 wrote:If you are pics it's better for me.
Very thanks

This picture gives a pretty good view of the piston, rod and ball socket.

thank you for your answers but it will be difficult to make oneself

Yes, it will be difficult, but it is the difficult things that are worth doing.

Like putting Monokote on a STOL wingtip.

Please post pictures as your project progresses.

no problems, but the next engine will be a little bigger, same a OS 10,or the cox 0.9 it will be a little easier to machining.
It's a similar in the 0.9 cox engine ?

frog349 wrote:Im a fitter turner as well operating cnc and nothing is too small!grind a b/bar out of a piece of hss and hold it in a collet if you dont have a b/bar small enough or a 'u'drill (ie a tap if you have no round hss). and g40/g41/g42 becomes your friend when writing in iso!Cheers Troy.

Yes but my cnc is very small it's a X2 it's not a industrial cnc ,I made ​​it myself, but the next one will be bigger and more accurate.And im not a turner it is just my hobbie

THE CURRENT MILL


the lathe


the next mill under construction



my workshop

chris74100 wrote:Hi, i'm frenche, sorry fbut i speak very poor english. It s possible to disassemble the piston rod in a 049 cox ? I want machining twins and I do not know how the rod is fixed in the piston.
My new engine is a .122 CI same the g mark engine (the cylinder of he cox is very too small for machining with my lathe and my milling machine)
If you are pics it's better for me.
Very thanks

chris74100: is your plan to machine the entire engine? why not start with the pistons and machine the other parts for the first prototype? or pistons and cylinders and machine whatever parts you will need to complete the rest. the pistons, cylinders, crankshafts, and crankcases are readily available in the U.S., England and Germany. and if you need any help finding or getting parts feel free to ask. most of the vendors who advertise here ship worldwide.
also there is an older 3 - part piston from the early 1960's discussed and shown in other discussions here. i think it has a circular clip holding a plate holding the connecting rod into a cup in the piston head. not too many were made.


happydad

That is a very nice shop.

Chris,

You have a very nice shop. Of the tools you display, I know how to use the vise. :-)

Don't worry about your poor English, you write much better English than I do French. We can understand what you are saying.

If you do an online search, there are groups of machinists who build small engines and could probably give you more ideas and information.

The G-Mark was an excellent engine.

Good luck with your project. Keep us posted.

George

happydad wrote:
chris74100: is your plan to machine the entire engine? why not start with the pistons and machine the other parts for the first prototype? or pistons and cylinders and machine whatever parts you will need to complete the rest. the pistons, cylinders, crankshafts, and crankcases are readily available in the U.S., England and Germany. and if you need any help finding or getting parts feel free to ask. most of the vendors who advertise here ship worldwide.
also there is an older 3 - part piston from the early 1960's discussed and shown in other discussions here. i think it has a circular clip holding a plate holding the connecting rod into a cup in the piston head. not too many were made.


happydad

the piston and cylinder parts are the most difficult to machine and therefore the most interesting.
Buy these items get a lot of interest in the manufacture of motor

chris74100 wrote:

happydad wrote:
chris74100: is your plan to machine the entire engine? why not start with the pistons and machine the other parts for the first prototype? or pistons and cylinders and machine whatever parts you will need to complete the rest. the pistons, cylinders, crankshafts, and crankcases are readily available in the U.S., England and Germany. and if you need any help finding or getting parts feel free to ask. most of the vendors who advertise here ship worldwide.
also there is an older 3 - part piston from the early 1960's discussed and shown in other discussions here. i think it has a circular clip holding a plate holding the connecting rod into a cup in the piston head. not too many were made.


happydad

the piston and cylinder parts are the most difficult to machine and therefore the most interesting.
Buy these items get a lot of interest in the manufacture of motor

search for "3 part piston" and see this pic. there is also an explanation.



hope this helps.

happydad

happydad wrote:
why not start with the pistons and machine the other parts for the first prototype? or pistons and cylinders and machine whatever parts you will need to complete the rest. the pistons, cylinders, crankshafts, and crankcases are readily available in the U.S., England and Germany. and if you need any help finding or getting parts feel free to ask. most of the vendors who advertise here ship worldwide.
also there is an older 3 - part piston from the early 1960's discussed and shown in other discussions here. i think it has a circular clip holding a plate holding the connecting rod into a cup in the piston head. not too many were made.


happydad

I reflected well and you are right, I am buy 2 piston and 2 cylinders and I am make a twin. I machining the crankshaft and the "body"(crankcase ?) of the motor. the fuel tank is same at the babe bee with the reed valve. know you the screw thread of the cylinder ?

17/32-40 is for the .049 head and cylinder.

Jason_WI wrote:17/32-40 is for the .049 head and cylinder.

Thanks, it's a very fine thread, i supposed no tap exist ?

I think make the crakshaft as gmark, I find that's a very good idea and it's no dificult to machining