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Member postings for KEITH BEAUMONT

Here is a list of all the postings KEITH BEAUMONT has made in our forums. Click on a thread name to jump to the thread.

Thread: Lidl Portable Bandsaw
03/12/2020 16:56:07

Band saw now assembled and tested with a 1 inch diameter piece of EN1A and it went through it ,dead square in about 30 seconds. Had a fumble getting the blade in,until I realised the tension lever still had more movement. It is very stiff. It all seems a sturdy piece of kit and I am now pleased with it.

Keith

03/12/2020 11:28:54

Hi Ian and Martin,

Thanks for your swift replies. I will now take it all out of the box and put it together. I will certainly follow the previous tips on working with it. I will report back later when I have got it running. I will only be using it in the horizontal bench mounted position ,as I already have a two speed vertical wood band saw ,fitted with a metal cutting blade.

Keith

03/12/2020 10:08:36

Having followed this thread I ordered the Scheppach Aldi version and it arrived yesterday. I have not unpacked it yet other than to take out the instructions. The opening paragraph says "The portable metal band saw with speed setting isexclusively suited for cutting wood,tubes,profiles and non-ferous metals".The instructions are 90% safety warnings of every description, but not much else.That is the only referance to metal cutting, although wood is mentioned several times. Several metal sections are shown in a how to position it in the vice diagram, but no round section is shown.. I am now wondering if this is not capable of cutting MS bar. I do not use beyond EN 8 in my model work and would expect the saw to be capable of cutting this.Has anyone else got this Scheppach saw up and running and is it capable of cutting MS?

Keith

Thread: Mini Lathe Upgrade
29/11/2020 20:19:52

I have been using my Clarke 300 mini-lathe regulaly for 14 years. I have changed the bearings some years ago, but in all that time I can say I have not had any problems with parting off or deep grooving. I always run the lathe in reverse with the tool upside down. My usual tool is mounted in a quick set post and is 0.060" wide. The big advantage of having a bolt on chuck and being able to reverse the motor,seems to be ignored by a lot of users.

Edited By KEITH BEAUMONT on 29/11/2020 20:22:09

Thread: Boll-Aero 1.8cc Diesel
16/08/2020 16:40:34

Thank you everyone that has shown interest in this project. The one thing we all seen to agree on is that Silver Steel is not good for a component that is to have a thread and will be stressed in use

Keith

15/08/2020 20:19:06

Hi Ramon, I do have a microscope and with difficulty have managed to get the web under it. I can see that the shear has started at the root of the thread, Silver steel always looks a bit rough to my eye when using a die to to cut the thread and the roughness is clearly a tearing action that can develop to a crack under load and heat..

Probably a subject for another thread, but I am now wondering why Stubs and others chose this steel particulaly, to offer it in centreless ground pieces. Wikipedia says it is a Tool Steel, often used for knife making.

Keith

15/08/2020 17:19:23

Ramon,

I did hone and lap the surface of the silver steel, then made a bearing to fit. I think the fault did develop originaly when it was heated for silver soldering,as you say.. All good experience and an idea i had had for some time that will not be repeated..

Keith

15/08/2020 16:05:55

Niels,

The original shaft drawing is totaly different from what I made.

I am interested in the fact that you think the backfire started the problem. It is quite common to get backfire when starting diesels and I have some scars to prove it. Have you any opinion regarding my use of silver steel?

The replacement will be machined from one piece of EN8.

Thank you for your input.

Keith

15/08/2020 14:37:36

2-dsc04029.jpgNiels,

1-dsc04027.jpgI have taken two hand held photos of the web face and they are as good as I can do them. Hope this helps

15/08/2020 10:18:52

Thank you Diogenes II.

I can report an interesting (to me) development. Normally I make crankshafts from one piece of EN8.This time,as I was in the experimental mood, I built it in three pieces.The shaft from silver steel and threaded to a shoulder to receive an EN1A web,screwed on tight and silver soldered Crank pin was pressed in with a .002" interference fit. All looked good and made with minimum swarf. Yesterday,as the weather was cooler and I could have the door open, I thought I would have another test run or two, First 3 minute run,no problem. After cool down, attempt another and got a backfire that loosened the prop, Tightened this up, Next flip,single pop and the prop slowly came towards me, pulling the shaft of the crankshaft with it. It has sheared cleanly at the face of the web. When it was silver soldered I let things cool down slowly and did not attempt any further heat treatment. I did leave a .020" radius in the corner of the shoulder.. I have no informed knowledge of the stress loads at the point of failure and hope someone might suggest a reason for for it. Perhaps silver steel is not the right material

Keith

13/08/2020 20:51:18

I should add that, having made the piston heavier, I took 11 grams off the weight of the previously circular crank web,to compensate. I have not carried out any weight measurements for balancing , but the engine runs with minimum vibration.

Keith.

13/08/2020 20:19:08

Thank you Rod, Jason and Ramon, for your comments. They are much appreciated.

An example of how one mod created the need for another is with the original piston. It is always my practice to finish machine the piston inside shape, leaving the outside 0.020" oversize and then part off. The piston is then bonded with super glue to a mandrel made to fit the inside shape. This mandrel is drilled right through and a short thread put in the back end to take a cap head. and by inserting a short pin the cap head is then used to push the piston off the mandrel when heat is applied. All finish machining of the ouside and honing and lapping is carried out from this mandrel. The original internal shape of the piston is by drilling only. Hence the internal top shape is the 118 degree cone from a drill. Having lapped it to perfection,I proceeded to apply heat and screw the cap head and was appalled to see the pin in the mandrel,push straight through the top of the piston! I made a new piston, this time to the conventional internal slotted shape, plus I added .050" to the top thickness. To compensate for this and keep the timing the same, I milled a .050" deflector notch in the front edge,similar to a Mills 1.3cc. Also shortened the contra piston by the same amount. Whether this has improved performance I have no idea ,but it is fun solving such a problem.

Keith.

13/08/2020 11:13:15

For reasons unknown to me, the photos have appeared in reverse order to that that I thought I had arranged.

Keith

13/08/2020 11:08:08

8-dsc04019.jpg7-dsc04013.jpg6-dsc04021.jpg5-dsc03976.jpg4-dsc03959.jpg3-dsc03943.jpgThese are photos of my latest model engine build. After the successful making of the Chris Boll designed Cicada,I thought I would follow up with another of his designs for which drawings are freely available to download and are designed to be made from bar stock. The Bol-Aero has radial mounting and this does not fit well with my test mount set up, so I decided to make the crankcase with standard beam mounts. The carb, as drawn, is mounted on the side of the crankcase and would also not be compatible with my test mount, so that was moved to the rear face. This gave the opportunity to have another exhaust port, but this meant moving the fuel bypass to the front of the liner, and, so it went on. As every part came up for scrutiny before machining,I found one mod was leading to another and the finished engine only has the bore, stroke and timing of the original, plus the backplate of the crankcase is "as drawn" and that is all.

I had no problem finding the compression point that fires it up and it started on about the third flick. After 6 short 3 minute runs, cooling down between each, it is happily running at around 6500 RPM with a "8x4" nylon propellor. At this stage I decided to make it pretty and sent the cooling fins, prop driver and spinner to my friendly anodising firm for the black finish, with which I am very pleased. As my initials are J K B, I thought I might be cheeky and describe this as the "J K BEE" version of the BOLL-AERO 1.8 diesel.2-dsc03947.jpg

Thread: DRO installation
27/04/2020 14:06:55

Hi Keith

I fitted a magnetic system to my Clarke 300 a year ago and submitted it as an article to Neil, but it has not got to the top of his pile yet. If you wish you can put your e mail address in my message box and I can then give you the gist of it

Keith

Thread: Cicada 1.3cc "diesel\2
17/04/2020 11:14:56

Danny, I have put amessage in your box,.

Keith

17/04/2020 09:41:52

jason , I am a bit confused about the mention of Rod Jenkins?

Keith

17/04/2020 08:39:03

Hi Danny, That is agood idea to swap notes.I have seen the vid of Eds running from your link. Is he on this Forum? I notice on that vid link that Chris Boll ,the designer is mentioned. Is he contactable? I am in UK and it sounds as though you are in OZ. I have recently finished the Sparey .8, wwhich is really .6cc. Photos are in my album under Chenery VEE TWIN. It runs very well. I also made the 5cc version several years ago.

I share you thoughts about our hobby.

Keith

16/04/2020 21:15:26

Thanks Jason,

I was hoping some one would comment on how fuel behaves when being transfered by crankcase compression. or that they had made this engine. Cannot believe I am the only one to do so.

Keith.

16/04/2020 20:39:32

Photo of the Cicada running at last1-dsc03925.jpg

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