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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: Tormach Flycutter with SEHT Insert
18/04/2017 21:57:54

I have one of these fly cutters and it does perform well, especially on Aluminium. It produces a finish such that it is almost impossible to see any machine marks.

Thread: Motorcycle General Discussion
16/04/2017 14:09:18

I have a similar problem, lots to do, not enough time or space. I want to make a 700cc Vee- twin using a couple of Humber side valve cylinders making the cases from solid but just don't have the time. I would also like to resurrect my A4 Pacific in 5" gauge project again and so many other things.

16/04/2017 11:56:20

Nice Velo Shaun,

ere are some shots of my Venom, fitted withAlton Electric start/alternator, Thurston belt drive & clutch conversion, Thurston Thruxton type cylinder head, BTH self generating magneto and Mikuni Carb.

dsc03650-2.jpgdsc_3519 (1).jpgdsc03642-2.jpg


The second picture shows the bike after fitting the Thurston Head and Mikuni carb.

The bike is going into the spring sale at Stafford.

Edited By Bob Rodgerson on 16/04/2017 11:58:22

Thread: What Did You Do Today (2017)
04/04/2017 14:43:12

I took a bike life to my last club auction night (exactly like yours Harry) but i couldn'even give it away. It is slowly rusting away but I bet if some of the traction engine builders had seen your use of the bike life they would have snapped it up.

Thread: Aircraft recognition problem
30/03/2017 17:18:08

Another good site to monitor flights by is this covers all commercial and private activity mostly world wide. It is amazing juts how many aircraft there are flying around the world at any time. If you want to hear whats going on tune in to live you will need the airport code such as KFFZ which is Chandler tower in Phoenix Arizona (well worth a look and listen to because I think it must be one of the most busy airspaces in the world for flight training).

I would think it will be easy to get the Airport/ARTCC code by doing a google search

I was able to hear my son talking to the tower a few times when he was training with Oxford Aviation recently.

Thread: What Did You Do Today (2017)
22/03/2017 14:20:47

Like everything these days, museums have been dumbed down because modern man seems to be suffering from attention span deficiency and can't be bothered to think or use his brain for more than a minute at a time.

Most if not all of the Science Museums in the UK have gone the same way. As a kid I remember spending hours and hours at the museums in South Kensington looking at all of the exhibits and enjoying being able to see in detail all of those wonderful exhibits and models.

Nowadays it seems that the kids have to be entertained by some pretty crappy simple push button displays or interactive stuff not even closely related to museum activities.

It's the schools job to educate, the museums job is to display our history.

Thread: drilling sandstone
21/03/2017 16:32:55

If you are planning a decent sized centre holes then why not try a diamond coated hole saw. I drilled a 5" dia. through a reinforced concrete tank with one without any problems. I think if you try to chain drill you will break the sandstone before you get the round bit out.

Thread: WARCO WM-250 lathe family and WM16 mill
20/03/2017 19:21:35

I used to get backache when I was working on my BH 600 because it was bit low for me. When I bought my CNC mill I put both my BH600 manual mill (Superlux) onto moveable trolleys with lockable wheels, they were made from 4" channel and the castors were a further 4 inches tall so I increased their height considerably.

As a result I no longer get backache when working at the lathe or the mill but I do get a lot more hot chips down my shirt from the lathe than ever before and I find it difficult to look over the top of the tool post.

Thread: Has the quality of HSS changed over the years?
10/03/2017 09:56:55

When I bought a new Myford lathe in 1980 I bought with it a set of Eclipse HSS lathe tools. These tools were of excellent quality and worked really well, I still occasionally use the few that haven't been ground down to nothing over the years. They held their edge for a long time between sharpening.

Similarly the Eclipse HSS tool blanks used to grind up into all sorts of tools had similar good wear properties. Step forward to today and I find that any of the pre formed HSS lathe tools are of very poor quality and do not hold their edge for long. As for the HSS blanks, they seem only useful as makeshift parallels.

I have just finished a job that involved countersinking 900 holes in plain Carbon Steel. Because of the nature of the job I thought it best to order a couple of good quality Countersinks, they lasted for no more than about a dozen holes each. In desperation I resorted to using an old Dormer twist drill carefully shortened and ground with a 90 degree point, this lasted for all the remaining 800 and odd holes without the need for a resharpen. I guarantee that if I had tried to use one of my fancy coated drills it would likely have either shattered or worn out in record time.

Drills are, in my opinion even worse than the lathe tools, I have one set that just wilt when I try to drill anything other than the softest material, favourite method of failure is for the tips of the flanks to break and the drill body diameter wears to a reduced diameter for the depth of the hole, rendering the drill useless for any further work.

Am I the only person who seems to be finding this to be the case

Thread: What Did You Do Today (2017)
04/03/2017 18:00:04

Hi Windy,

I couldn't believe the method advocated by motorcycle manufacturers in the twenties of aligning the crankshaft journals and crank pin by beating them with a lead hammer and squeezing the flywheels. However with tapered end crankpins itv works well and it's surprising how rough you have to get. I've done a few.

Thread: The Workshop Progress Thread (2017)
23/02/2017 11:03:03

Today I finally got one of the batch of Wire Wheel Hubs I am drilling for somebody done after recovering from a nasty CNC crash. This was caused by me making a Freudian slip when I entered a Z value in my g-code as 48 instead of 84. I could see that the spindle was going to hit the work if I didn't stop it but I had the camera ready to take a picture and by the time I put it down it was too late.

The spindle contacted the work, snapped the drill, rotated the threaded hub anti clockwise and while it was doing this it pushed the adjustable angle plate out of alignment and ground the ER collet nut up a bit. The hub seized on the thread and took a lot of effort to get it off the faceplate fixture. I had to take the fixture off the rotary table, put it in the lathe 4 jaw chuck, fit the three jaw chuck on the small diameter and using metal bars and a 3foot long cheater bar on the end of one of them work the hub free. Much to my amazement there was relatively little damage to the threads on the fixture or the job and I was able to dress this with the Dremel. The outer diameter of the hub was badly marked and I had to re-machine this to get rid of the damage but I don't think this is critical so all in all a good recovery.

The job is not as straight forward as it looks because the spokes are drilled at an angle through the small end so the two rows of holes at that end are drilled separately with the angle plate set at 14 degrees then 13 degrees respectively. They are also drilled with an offset from the centre line. Getting the angles sorted out and drawing the hub was the biggest part of the job. I still have to countersink the holes which I will do as a separate programme but at least the main bit works.dsc_4078.jpg





Edited By Bob Rodgerson on 23/02/2017 11:05:36

Edited By Bob Rodgerson on 23/02/2017 11:14:50

Thread: What Did You Do Today (2017)
19/02/2017 18:17:11

I have just got home from the MMEX exhibition in Oldham I have to say that in terms of venue size and the number of people attending , the organisers seem to have got it spot on.

For once at an exhibition you were able to browse the trade stands for bits and pieces without having to jostle for position or getting a swipe from a back pack carrier.Similarly you there was plenty of opportunity to take in all the models on display. There was a good variety of locomotives on display but other areas were under represented but I am sure this will be improved upon next time.

Thread: Manchester Model Eng. Exhibition.
18/02/2017 18:57:34


I was there and I thought it a better venue than last year. Parking was a bit better than last year too. The club exhibits are very good with an emphasis on locomotives. There was also a reasonable spread of Trade stands which I took advantage of to buy some materials and equipment.

I think it is worth going to but I might be a bit biased, having a model on display.

Thread: What Did You Do Today (2017)
17/02/2017 19:28:52

Today I took my 200 cc flat twin engine to the MMEX to set it up as one of the exhibits that are on the stage as a "Feature" model. I will be back there again tomorrow morning and again on Sunday along with members of the Stockport Society of Model Engineers.

Though in general good shape, years of storage in an overcrowded workshop has resulted in some nasty dents in the inlet manifold for which I apologise, in fact it is the one area that needs attention. The tight bends in the brass tubing are wrinkled and slightly flattened, probably converting it to twin carburettors would improve the look and stop icing of the manifold, to which it is prone.

Obviously I can't run the engine indoors so the next best thing is if you want to see it run is this video I made of it running about 6 months ago.

Edited By Bob Rodgerson on 17/02/2017 19:29:32

Edited By Bob Rodgerson on 17/02/2017 19:31:35

Thread: Cheap chucks from ebay.
15/02/2017 11:05:09

Caveat Emptor. If you look at my youtube videos you can see just how appealing some of these things can be. The chuck in question was bought new at the thousand engine rally in Cheshire and is a shining example of poor quality control.

Just search Bob Rodgerson

Thread: Workshops
15/02/2017 11:02:01

Mine is more or less a purpose built garage/workshop based on a tandem double garage 13Ft wideX 30 ft long.

It houses, in three sections separated by curtain doors.

Section 1 : Workbench,Bench Grinder, brazing, welding equipment and electric heat treatment furnace

Section 2: Tormach CNC Mill, Myford Cylindrical grinding machine, Warco BH600 lathe, Warco Mill , Tool and cutter grinder, end mill grinder,Bench Drill and another bench for light assembly work.

Section 3: Motorcycles, BSA A-10 650 RGS Lookalike, Humber 350 OHV, Humber 350 Side Valve, and 500 Thruxtonised Velocette Venom as well as in the roof space loads of Humber frames engines and different project bikes.

The bike section is about 9 ft long and I can store four or five bikes 2 on top of the purpose made storage lift and one or two underneath plus one parked against the wall to allow access to the other sections of the workshop.

Regardless, no matter what I do it always looks a mess but that is because there is so much stuff in there but I'm like John Rudd, I know where most things are. (It's in here somewhere!)

Thread: Reaming cast iron
14/02/2017 16:07:37

No Lubrication required. I think if you did use oil it would make a right mess to clean off the reamer.

Thread: What Did You Do Today (2017)
12/02/2017 12:56:25


you should have gone for Granite, would have made a nice layout table.

Thread: Quality digital vernier calipers
12/02/2017 12:54:38

I vote for Mitutoyu, mine has been going strong for years. I have found cheaper ones don't last the distance and use batteries much quicker.

Thread: Hello from NE Scotland
12/02/2017 12:51:43

Hi John,

Welcome to the forum. I worked on all of the Forties platforms as a driller Night Toolpusher and Toolpusher/Drilling Supervisor so you might well have bumped into me at some time in the past I was there from 1980-3 and worked for BP until 1990 when I went to work for myself as a consultant.

Names that you might remember are Mike Diamond, He was a Tiffy Eex Sea Conquest, Ian Carter, Old Toolpusher. Alan Miller BP Toolpusher.

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