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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: What Did You Do Today (2017)
23/06/2017 17:29:30

Nice work John, almost makes me want to buy a 3 D printer.

Thread: Countersink
18/06/2017 16:02:57


are the valve cages cylindrical, if so why use a countersink?

Thread: Cylinder steam passage repair ?
08/06/2017 17:49:43

I would have thought that if there is sufficient metal that it could be tapped and a threaded plug fitted or it could be silver soldered but not sure what it would do to the finish.

Thread: What Did You Do Today (2017)
08/06/2017 17:47:12

Today I went to pick up the repaired Ballscrew for the Tormach and while on the way I picked up 3 lengths (3.5m) of .625", .875" & 1.0" EN36 at High Peak Steels.

I noticed that when I got them home each bar end had a different colour painted on it so I hope they are colour coding them for sizes otherwise I have three different grades of metal. No doubt I will find out when I try to case harden it.

07/06/2017 21:10:02

Hi Murray,

I moved from Whitley Bay about 10 years ago but still go back to the North East regularly to either meet old pals or to ride vintage bikes on lovely quiet roads. I now live in Cheadle Hulme.

You are best to call One Stop, they are pretty helpful people, at times a bit gruff but well meaning. I have dealt with them a lot since moving here and they have a good range of the usual stuff EN1A. EN 8, EN 9 & En24T etc. They will also cut steel plate up to 12mm and bend/fold stuff too. Not sure what their range is for deliveries though.

Thread: Piston rings muddled up
07/06/2017 16:34:38


I hope you gave the fuel a spoonful of R-40 to protect the valve gear and to give that nice aroma on top of the sweet smell of freshly mown grass.

Thread: What Did You Do Today (2017)
07/06/2017 16:28:19

Muzzer, not quite Preston but there are plenty of suppliers around Manchester.

One stop Metals at Trafford Park cut to length and deliver. I have just ordered 3 lengths of EN 36 from High Peak Steels in Glossop. They also cut to length and deliver.

06/06/2017 16:27:00

EmGee/Andrew, yes my machine is relatively new but I have suffered some bad crashes whilst negotiating the learning curve to CNC machining.

I first noticed the loss of travel when cutting in a circular path but more so when thread milling external threads, there were distinct marks more or less diametrically opposite each other about 30degrees off the X axis centre line.

I did the standard checks that Tormach recommend using the conversational programming and found that advancing the table .010" then returning it it would only show .007" travel.

The last crash I had completely broke one of the TTS tool holders at the end of the parallel shank and I think that this was the one that did it.

I only hope that with the X axis sorted and the Gibbs adjusted that the Y axis is within spec otherwise I will have to cut a hole in the workshop wall to permit removal of the stepper and also make an inspection cover in the machine stand to allow me to unscrew the ball nut housing because there is no room in the workshop to get any kind of lifting gear into position to lift the table and saddle.

05/06/2017 17:51:03

Recently I had noticed some loss of accuracy of my Tormach Mill and carried out checks for loss of travel. The X-Axis showed a loss of travel of .003".

To import new ball screws for both the X & Y axis would cost about £2k by the time import duties and shipping costs are taken into account so I decided to investigate a cheaper option.

A Google search found a company in Nottingham called Ballscrew Services who seemed to be able to offer a strip down and inspection plus repair and rebuild service. I gave them a call and asked them if they could take a look at the ballscrew for me. They said to send it to them, they would appraise it's condition and let me know what the costs would be. On Thursday afternoon I sent the item off in the post and on Friday at mid day I gave them a call to see if it had arrived and they said it had. The works is shut from Mid Day on Fridays till Monday mornings so I had to wait over the weekend.

Early this afternoon I got a call from them confirming that they had fixed the ballscrew , a condition report had also been sent to my email address. New slightly larger balls had been fitted and preload had been restored.

The cost for this service was £280 plus VAT which is a lot cheaper than importing a new one from the States.

I have no connection with this company other than being a very satisfied customer but thought that anybody that is using a CNC machine might want to know about them.

01/06/2017 13:13:34

I thought that you weren't supposed to import Meat or Dairy goods into the country.

Thread: Who has bought a Tormach mill ?
11/05/2017 09:23:57


I used the same company as Andrew to import my mill. , will find them. They have recently handled the import of a PCNC 1100 for Jeff Whitaker who contacted me and whom I supplied the information required.

He has received his PCNC but has had a few issues with parts of his order not being there and one or two minor technical issues. Most of the problems seem to be down to Tormach changing the warehouse/shipping system, I believe to a new location and the technical issue was down to poor QC of tooling.

In fairness to Tormach, these issues have been dealt with but I am sure they aren't pleased with their performance with this particular order. Hopefully they will have sorted out the QC issues by the time you get your order in.


Thread: The diesel controversy
07/05/2017 17:34:10

Ethanol is horrible stuff. It dissolves older paint like Nitromors used to, rots plastic and draws in water which settles in the bottom of steel tanks and causes untold damage to fuel systems.

Millions of people are starving all over the world and the US farming lobby to grow more and more Petro crops to put the stuff into fuel as an additive.

Russia also grows millions of acres of wheat for the same purpose.

It must cost a fortune to brew and probably generates more greenhouse gasses than would be generated by burning straight mineral petroleum.

Thread: Tormach Flycutter with SEHT Insert
20/04/2017 14:47:42

Paul, I should have answered your question ages ago but I've been a bit busy lately. I am using a Tormach mill and kept the speeds high and feed moderate with a shallow depth of cut about .020" for roughing and .002 for finish cuts. I used coolant too.

I used the tool on some EN24T and found that it cut OK but there was some slight Hammering and it was slower than using a face mill so I reverted to using that for steel.

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.

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