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Oliver Evans Beam Engine

Relief for and eccentric.ME4159

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David Caunt04/03/2021 15:47:02
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I have been slowly plodding my way through building this model of Oliver Evans Beam Engine and have come across something that I'm not sure how to do.drwg 13.jpg

The drawing shows a relief. I'm not sure what is the best or even correct way to do this.

!. Doing this is by working out the steps and using a mill to cut out deeper and deeper steps.

2.Sitting the base upright and cutting it with a fly cutter. This means making a right and left cutter.

3. Buying a 25mm x ? slitting saw and again mounting the base upright and making repeated overlapping cuts down the face.

I'm not even sure that this will clear the eccentric. If anyone has got a good idea and perhaps has even built this model your advice would be appreciated.

Dave

Edited By David Caunt on 04/03/2021 15:48:51

Edited By David Caunt on 04/03/2021 15:49:38

Journeyman04/03/2021 16:03:55
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1159 forum posts
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As the base is only 5mm thick I would be inclined to just make a rectangular opening in the base. Then if the eccentric does not clear it is easy to open out the hole and if necessary make suitable relief in the wooden plinth which I assume the 5mm base sits on.

John

Edit: Typo

Edited By Journeyman on 04/03/2021 16:04:45

Jeff Dayman04/03/2021 16:08:14
2226 forum posts
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In the days before mills were common in home workshops, the recess may have been done by clamping the work to the lathe cross slide and using a between-centres boring bar to produce the recess. A flycutter mounted securely in the lathe chuck may also work. The work is well supported with either approach. depth of cut could be controlled by adjusting cutting tool position outward in the boring bar or the flycutter. Just food for thought.

JasonB04/03/2021 16:10:44
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A single point tool in the end of a bar set to swing the 25mm radius would do just worked up and down, no need for left and right hand.

The other option is to cut out a hole and then let in a piece with a concave top which would be easier to cut than having to stop at the edges of an integral recess. or you could bend some sheet to a curve and let that into the hole.

David Caunt04/03/2021 18:12:57
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99 forum posts
38 photos

Thanks for the help. I feel with my thoughts about the possibility that the eccentric would touch I will just cut it out.

I am surprised that nobody else has built this although ME4159 was a long time ago.

Thanks again

Dave

David Caunt10/02/2022 17:32:09
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99 forum posts
38 photos

Still plodding on although I seem to lack a lot of enthusiasm these days.

img_1855_1494.jpg

Just realized I have to make the base box before carrying on with the flywheel etc.

David Caunt02/05/2022 13:18:57
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99 forum posts
38 photos

From this.

1.jpgTo this 23_1596.jpgwithout a RT has taken more time than I ever thought

Hopper02/05/2022 13:51:50
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6404 forum posts
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Darn good effort without an RT! Well done sir.

Phil H102/05/2022 15:37:55
459 forum posts
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Perhaps too late maybe? Another alternative to the curved slot underneath the eccentric would have been to add some 'pads' underneath all the other parts. A simple mod if it is planned out at the start though.

Phil H

Bazyle02/05/2022 17:07:04
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Posted by David Caunt on 04/03/2021 18:12:57:

I am surprised that nobody else has built this although ME4159 was a long time ago.

Phew, only 2001. I was thinking from that statement it was a pre-WW2 design. This is like a few weeks ago to most of us so haven't got round to it yet.

David Caunt02/05/2022 21:46:28
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99 forum posts
38 photos

Perhaps too late maybe? Another alternative to the curved slot underneath the eccentric would have been to add some 'pads' underneath all the other parts. A simple mod if it is planned out at the start though.

Phil H

Sorry Phil there is no eccentric on the flywheel. So I'm not sure what you mean.

 

Dave C

 

Edited By David Caunt on 02/05/2022 21:47:44

Phil H103/05/2022 04:07:57
459 forum posts
60 photos

Dave,

I was trying to address your original snag regarding the machining of a tricky radial slot underneath the eccentric i.e., if you used rectangular pads underneath each of the parts that bolt down to the baseplate, the eccentric would be higher up and hence no need for a clever curved slot. Easier to describe with a sketch.

Phil H

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