Author Topic: Edwards 5 Cylinders.  (Read 8773 times)

Offline Admiral_dk

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Re: Edwards 5 Cylinders.
« Reply #105 on: May 09, 2019, 04:46:09 PM »
Oh man - that could have happened to me too  :facepalm2: - maybe paint the 1/4" red on the shaft as a warning in the future  :thinking:

Since there is a lot of work in the masterrod - do you open the rest (or at least one piston for a 1/4" pin, change the bronze bearing (if there is one) is probably the easiest ….

Offline glorfindel

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Re: Edwards 5 Cylinders.
« Reply #106 on: May 09, 2019, 06:41:19 PM »
Oh man - that could have happened to me too  :facepalm2: - maybe paint the 1/4" red on the shaft as a warning in the future  :thinking:

Since there is a lot of work in the masterrod - do you open the rest (or at least one piston for a 1/4" pin, change the bronze bearing (if there is one) is probably the easiest ….
I made 2 of those some times ago.

When you got all the cnc prog done, it's easy to do a couple of those ;-)

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Offline petertha

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Re: Edwards 5 Cylinders.
« Reply #107 on: May 09, 2019, 08:04:17 PM »
The ends are a little bit bigger than the pin, so i hope it will do the job.
Not quite sure what you mean there. I assume pads have to be the same diameter as wristpin to recess in the pistons hole? And the wristpin length + 2 pads must be less than bore by some clearance amount? What am I missing?

Offline glorfindel

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Re: Edwards 5 Cylinders.
« Reply #108 on: May 09, 2019, 08:09:08 PM »


The ends are a little bit bigger than the pin, so i hope it will do the job.
Not quite sure what you mean there. I assume pads have to be the same diameter as wristpin to recess in the pistons hole? And the wristpin length + 2 pads must be less than bore by some clearance amount? What am I missing?

The pads are a little bit bigger (diameter) than the wristpin, so they should stay in place.

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Offline Admiral_dk

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Re: Edwards 5 Cylinders.
« Reply #109 on: May 09, 2019, 10:10:54 PM »
Quote
The pads are a little bit bigger (diameter) than the wristpin, so they should stay in place.

Yes, but that way, they might also be a pain in the proverbial if you ever need to get things apart again ....

Offline glorfindel

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Re: Edwards 5 Cylinders.
« Reply #110 on: May 09, 2019, 11:32:00 PM »
Quote
The pads are a little bit bigger (diameter) than the wristpin, so they should stay in place.

Yes, but that way, they might also be a pain in the proverbial if you ever need to get things apart again ....
I hope a gentle tap will do the job ;-)

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Offline glorfindel

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Re: Edwards 5 Cylinders.
« Reply #111 on: May 10, 2019, 06:14:04 PM »
Ring blank is ready to be sliced by the wire edm.

Then the will be heat threated at 950F for about 10min.

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Offline glorfindel

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Re: Edwards 5 Cylinders.
« Reply #112 on: May 13, 2019, 04:15:30 PM »
Waiting to be sliced.

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Offline glorfindel

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Re: Edwards 5 Cylinders.
« Reply #113 on: May 14, 2019, 07:31:46 PM »
Heat treatment seems to have worked!!!
No big deal with TTT curves.

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Offline glorfindel

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Re: Edwards 5 Cylinders.
« Reply #114 on: May 14, 2019, 10:07:39 PM »
For those who are not familiar with ttt curves.


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Offline glorfindel

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Re: Edwards 5 Cylinders.
« Reply #115 on: May 15, 2019, 03:05:33 PM »
Those little things are brittle arent they? ;-)

I will have to make some more lol!!

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Offline Admiral_dk

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Re: Edwards 5 Cylinders.
« Reply #116 on: May 15, 2019, 04:52:30 PM »
Quote
Those little things are brittle arent they? ;-)

Yes and they always has been when made from cast iron - don't know if you can do the same tempering as with hardening in order to improve matters ….  :thinking:

Offline yogi

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Re: Edwards 5 Cylinders.
« Reply #117 on: May 15, 2019, 06:04:38 PM »
You have access to a wire EDM. That is awesome. I’m actually a little bit jealous.  :Lol:
I enjoy seeing the engine come together.  :popcorn: :popcorn: :popcorn:

Offline glorfindel

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Re: Edwards 5 Cylinders.
« Reply #118 on: May 15, 2019, 07:00:40 PM »
Quote
Those little things are brittle arent they? ;-)

Yes and they always has been when made from cast iron - don't know if you can do the same tempering as with hardening in order to improve matters ….  :thinking:
I made 12, only 5 make it to the piston lol!!!!

I'll get better ;-)

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Offline glorfindel

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Re: Edwards 5 Cylinders.
« Reply #119 on: May 15, 2019, 07:02:53 PM »
You have access to a wire EDM. That is awesome. I’m actually a little bit jealous. 
I enjoy seeing the engine come together.  :popcorn: :popcorn: :popcorn:
I'm blessed to have access to those fancy tool !!

It work great to cut the rings. Ut's the most precise tool we got, about +/- 0.00003

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