Author Topic: Two Cylinder Engine  (Read 13569 times)

Offline Old Bill

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Re: Two Cylinder Engine
« Reply #150 on: January 25, 2019, 10:18:40 PM »
The designs were made using the cam calculation programme on the MEN website:
http://modelenginenews.org/
Go to the menu on the left and open up ‘Resources’ and then ‘Design Centre’. This is a Java programme so I don’t know how well it will work on modern browsers.

One of our members has produced a version based on Excel which has a similar interface but I have not used it.

Nice job Roger. I really wanted to see it done before I have a go!

I want to mill my cams in the same way but, as you have predicted, the calculation software doesn't work in my browser! Might the Excel version be available to me please?

Keep up the good work!

Steve    :) 

Offline Roger B

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Re: Two Cylinder Engine
« Reply #151 on: January 26, 2019, 07:34:30 AM »
Thank you both  :ThumbsUp:

The Excel file is to big to link so I will send it by PM/Email. I have asked on another thread to find the author (I have forgotten who it was  :( )
Best regards

Roger

Offline Old Bill

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Re: Two Cylinder Engine
« Reply #152 on: January 26, 2019, 08:04:17 AM »
Hi Roger.

Safely arrived for which many thanks. That will save me a lot of graft and head scratching! What a wonderful resource this forum is!

Kindest regards,

Steve   :ThumbsUp:   ;D

Offline tangler

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Re: Two Cylinder Engine
« Reply #153 on: January 26, 2019, 09:37:32 AM »
Here's the link to the Excel file in my dropbox:

https://www.dropbox.com/s/i1h8fqc8h4ub4al/cam%20with%20draw.xls?dl=0

Cheers,
Rod

Offline Roger B

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Re: Two Cylinder Engine
« Reply #154 on: January 26, 2019, 07:34:41 PM »
Thank you Rod  :ThumbsUp:  :ThumbsUp:  :wine1:
Best regards

Roger

Offline Roger B

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Re: Two Cylinder Engine
« Reply #155 on: February 03, 2019, 06:49:35 PM »
The shortened bush was pressed into place in the vice and then I moved onto the shaft. Unfortunately I used the piece of silver steel from cutting down the bush rather than the planned piece of stainless  steel to make the shaft  :facepalm: Start again. The keyways were cut with the Proxxon micro mill together with the shaft for the Junkers governor.

While trying the pieces I decided I could thin the  ignition cam from 12mm to 9mm which would simplify fixing it. I then started the fixing hole for the ignition rotor.
Best regards

Roger

Offline Roger B

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Re: Two Cylinder Engine
« Reply #156 on: February 03, 2019, 07:01:33 PM »
I then used a 4mm end mill to cut a clearance for the screw head. A bit chattery in the Proxxon drill but it worked  :)

I then moved onto the valve spring caps. These started as 8mm aluminium bar. They were turned down to 6mm, drilled 2.4mm and reamed 2.5mm. The seats for the E clips were cut with a 5mm end mill and the rest was finished with a parting tool. I made five as I know that the swarf Gnomes like them  ::)  One from the horizontal engine is still missing  :(

The rocker shaft was made from 3mm silver steel and hardened by hanging from a magnet and heating until it fell of into the water bath.
Best regards

Roger

Offline JC54

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Re: Two Cylinder Engine
« Reply #157 on: February 03, 2019, 07:54:31 PM »
Many thanks Roger for the tip with magnet. I have great trouble with the colours when trying to harden steel. :old: :DrinkPint: JC

Offline Roger B

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Re: Two Cylinder Engine
« Reply #158 on: February 06, 2019, 07:56:39 PM »
Thank you for following along  :ThumbsUp: I find it useful for little pins etc that are difficult to hold. You probably don't get maximum hardness but it works for model engine parts in silver steel.

I cut the valve stems to length and then cut a groove for the E clips that retain the valve springs. Next up is the distributor cap and rotor. These are made from a length of 1" Delrin rod. This machines nicely but produces a mass of static charged swarf  ::)
Best regards

Roger

Offline Admiral_dk

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Re: Two Cylinder Engine
« Reply #159 on: February 06, 2019, 09:22:29 PM »
I see that you continue to make good progress  :ThumbsUp:

Offline Brian Rupnow

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Re: Two Cylinder Engine
« Reply #160 on: February 06, 2019, 09:47:37 PM »
Looking very good Roger. It won't be long now.---Brian

Offline fumopuc

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Re: Two Cylinder Engine
« Reply #161 on: February 07, 2019, 08:46:12 AM »
Hi Roger, it seems that the re-opening of the RD department, due to the the European weather conditions and the status of you build will match perfectly in some days.
Center of Munich is still under snow, but from today onward we expect temperatures above 5°C.
 

Kind Regards
Achim

Offline Roger B

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Re: Two Cylinder Engine
« Reply #162 on: February 10, 2019, 07:56:12 AM »
Thank you all  :ThumbsUp: Achim, unfortunately we haven't seen much improvement in the weather yet  :(

The rotor was turned from the same piece of Delrin. To maximise the material between the shaft and the electrode the hole was finished flat with a 4mm end mill.

The cap was bored out to 16mm. Due to the size of the boring bar there is a slight pip in the middle but that shouldn't cause significant problems. It then moved to the RT in the Proxxon drill for drilling and tapping the holes for the leads then onto the mill to finish the fixing flange.
Best regards

Roger

Offline Roger B

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Re: Two Cylinder Engine
« Reply #163 on: February 10, 2019, 10:41:19 AM »
The clearance angles and the slot for the contact breaker were cut on the same set up. A junior hacksaw was the quickest solution for the final cut. It all seems to fit together  :) Time for some fiddly brass pieces  ::)
Best regards

Roger

Online steamer

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Re: Two Cylinder Engine
« Reply #164 on: February 10, 2019, 01:32:31 PM »
It's certainly getting closer Rodger!   

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!