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Member postings for Bob Rodgerson

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

Thread: Getting started with CNC Machine & software choice
30/03/2014 22:01:42

I was looking at the Axminster offerings of milling machines and was impressed with the larger of the two milling machines and the level readiness to use. I realise that they are based on Seig machines and may not be as robust as the Wabeco machines but for the money you seem to get a lot more and a decent software package. Any thoughts anyone?

By the way. The crank case half and the crankshaft were all made on machines using my own on board CNC software. It works reasonably well but occasionally makes a mistake or two.

30/03/2014 19:52:17

Still not too sure about posting pictures . I want only links to the photos URL's I have listed not the whole library in my Photobucket account.

30/03/2014 19:44:41

I will try and add the remaining photos that I didn't manage to post yesterday.

 

 

Edited By JasonB on 30/03/2014 20:03:22

Edited By JasonB on 30/03/2014 20:07:51

29/03/2014 18:17:02

Hi Thor,

I have quite a few pictures to post but the connection I have in my hotel is so slow that I am running out of patience and time to sort out how they appear. When I get home in a few days time I might get round to posting some more. I didn't want to put a link to the photos and cancelled that half way through.

29/03/2014 17:22:54

I guess that doesn't work.

29/03/2014 17:21:21

Here are some pictures of a 1905 Rover crank case and crank I made from the solid.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Edited By John Stevenson on 29/03/2014 18:11:28

29/03/2014 17:14:29

Hi All,

thanks for the advice, plenty of food for thought there. I will do some more research on CamBam and Mach 3 the latter of which seems to be very popular.

I use AutoCad as a 2d drawing/design aid and to be honest found 3d work to be a little bit too complex when I dabbled in it over 10 years ago.

Most of my work will be the manufacture of such things as alloy casings and covers for small IC engines of various sizes up to about 650 cc, connecting rods in alloy and steel and general milling jobs. From what David is saying I will probably only require profiling.

I like a challenge and this is being taken on as a pin money maker and a means of keeping my brain active in retirement. From what I can see it should do all of that.

I will be seeing my accountant soon to see which way the wind blows with regard to the recent changes to pensions and to see if, while I still have my own company I can buy a machine on the company even though I will probably be semi retired and it will not return much profit. Even if I can't I will probably still buy a CNC mill out of my retirement fund.

I will keep you posted as to how things pan out. In the mean time I might try to add some of the projects that I have used my inbuilt CNC to make for various old motorcycles.

John I might just take you up on your offer and I will certainly steer clear of the Wabeco software if I go down the Wabeco route.

29/03/2014 09:06:41

I am considering purchasing a CNC milling machine with a view to light industrial use. I am reasonably conversant with AutoCad for which I have a licence. I have looked at all of the smaller machines on offer and am siding toward a Wabeco machine. Others I have considered are the Axminster and Arc Euro Seig machines. One option with the Wabeco machines is to buy them CNC ready and use controllers of your choice or to go with their own recommended software and controllers.

What I would like to know is which is considered the best option of both machine and software that I can integrate with AutCad?

I do not want to go down the second hand machine route preferring the guaranteed accuracy of a new machine.

Another thought I have had is, has anybody fitted a headstock with chuck to the table of a milling machine and used the X & Y axis to produce cmc turned parts?

I would also like to fit a CNC rotary table to the machine. Is this an easy option with the Wabeco machine?

Thread: What did you do today? (2014)
06/03/2014 21:53:35

I finally got a 1910 Humber 200 cc Side valve engine running, probably for the first time since the 1920's. An original barn find with a completely worn out engine that I was asked to restore.

Here it is just about ready for a test on the bench.

img_0973.jpg

And another shot from different angle.

img_0974.jpg

A lot of work was required to get it back into running order, this included making a new Con Rod, new cam followers, new push rods, & push rod guides, a complete set of fasteners and new bearings throughout.

I had no luck trying to remove the valve covers so I had no choice but to machine them out. Accurate set yup on the milling machine enabled me to machine away the body of the cover and leave just a very thin piece of it left which I was able to prize off from the top of the cylinder and then pull it out rather like they way you open a can of corned beef ,

dsc_2106.jpg

This photo shows one of the covers after it had been machined out.

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This photo shows how I was able to pull the remaining metal out just like opening a can of corned Beef.

dsc_2109.jpg

A rather blurred shot of the second valve cover being machined out.

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Preparing a fixture for holding the replacement valve covers.

dsc_2115.jpg

A valve cover blank about to be machined.

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Two valve covers almost finished.

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The two replacement covers almost finished. Only the hex heads to be milled then Nickel plated to finish.

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The replacement Con Rod.

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A pile of bits and pieces including the Cam Followers and shaft (lower right).

dsc_2167.jpg

The Engine nearly finished.

This engine being old has some unusual features that a lot of people probably haven't seen before. For instance the valves are not like conventional modern valves with a 45 degree sealing face, these valves have a flat sealing face that seats on a flat valve seat. (Imagine a mushroom, the seal being around the bottom of the mushroom cap).

The piston is cast iron, which was common in the early days of motoring, the piston ring was straight out of steam engine technology I believe it is of the Clupet type. No provision is made for adjusting valve clearances, the engine has to be assembled and the valves dropped in from the top and the valve stems ground until the desired clearance is obtained. Apparently some car engines were similar in the thirties. Rather than leave the owner with no adjustment I built up the engine with three cylinder base gaskets of .005" thickness so that if the valve clearance gets too much he can lift the cylinder, take out a gasket and not have to grind away the valve stems.

05/03/2014 10:34:17

Last night I fitted a Newton Tesla pre wired inverter drive to my Warco BH600 lathe. The instructions were clear and concise and I had no difficulty at all with the installation. The results are impressive. Originally, especially when using the Back Gear and auto feeds, the lathe was very noisy. Now with the lathe running without the auto feeds it is very quiet and even with the auto feed on there is only a mild gear whine which means that I might just be able to listen to the workshop radio while I work. (Once I get the workshop back together and the lathe back in it's usual spot that is).

The previous couple of nights were spent making a backplate for a small chuck to fit the drive head on my Myford MG-12 Grinder. The chuck had been in it's box since buying it nearly two years ago waiting for this job to be done. While doing this job I also modified the draw tube for the Grinder, the wrong type was supplied by the company I bought the grinder from, it being threaded externally. When I got the grinder it came with about 50 collets of various shapes and sizes and only one was threaded to suit the draw tube as supplied. I made up a makeshift draw tube which sufficed but I decided that the original draw tube looked much better so I decided to modify it to suit all of the c-5 collets.

I normally take my camera into the workshop but for whatever reason I forgot, I will take some pictures and post them soon.

24/02/2014 19:25:16

What did I do Today, well not a lot in the workshop because I am working away from home but I did sign up to the Model Engineering Site. so I would like to introduce myself.

My interests in Model engineering started at an early age when my father used to build the odd stationary Engine which he would run up from time to time. After leaving sSchool I served my apprentceship in The Wallsend Slipway & Engineering Company at Wallsend England . From there I left the shipbuilding and Marine Engineering industry to enter the Oil Industry, where I still work to this day.

When home on leave from work in Brunei in 1979 I bought a Myford ML7R which still serves well, albeit in my son in laws workshop. On returning to the UK permanently the following year I started work on 5" Gauge Simplex which my wife never thought I would finish but did some 5 years later. The next model was a 5" Gauge "Enterprise" LNER V3 to the Martin Evans design but with modified boiler to give a larger grate area. This took just over two years to make and proved to be a very good steamer and I got a lot of pleasure from it. I also started a Don Evans Doncaster Pacific loco in 5" Gauge that is languishing unfinished in the loft.

My son, as he grew up got interested in model aircraft. Needless to say I got pulled into the hobby and started making model aircraft and eventually model aircraft engines starting with a 27cc flat twin fourstroke. this was followed by a 5 cylinder radial of about 150cc, a flat twin of 200cc capacity and there lies under my workbench an unfinished flat 6 of 360cc.

Once my son left home for University I progressed or degenerated (whichever you prefer) into vintage and classic motorcycles which I still am heavily involved with. I have specialised in making components such as crank cases from the solid that you would find difficult to tell are not cast. My son in law is also a petrol head and I quite often end up making things for his vintage cars too.

My son has expressed an interest in the machine shop and presented me with Lew Blackmores book on the Bentley BR-2 so we are making a pair of these at the moment.

I moved from the North East of England to the Manchester area about 8 years ago and I live opposite the Stokport and District Model Engineering Society club track in South Park Cheadle Hulme. I have watched the track being built and the public attending andenjoying rides on their locos and this is making me think about getting the Doncaster down out of the loft.

When I get a bit of time I will post a few pictures of some of my engines and the motorcycles I enjoy keeping on the road.

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