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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: Motorcycle General Discussion
14/02/2018 10:22:40

I agree with Mike,

I have on the bench at the moment, a BSA Fury Engine which came out of the research department at Umberslade Hall I am building the engine up from part machined castings and a crankshaft/conrod assembly to, hopefully a working engine when it is finished. It is a long term project that is nearing completion with both crank case halves machined and the lower valve drive train and oil pump drives sorted. The cylinder head will be the next thing to be machined to accept the camshafts and once this is done I will machine the Hemispherical shape for each cylinder before it goes off to a cylinder head specialist to have seats and guides fitted.

The engine is very Honda like being a DOHC twin with the camshafts running directly in the Alloy Cylinder head rather than bearing bushes or needle rollers. Had more money had been available to develop it and improve reliability it could well have become the machine to beat it's Japanese rivals. However I do think that by the early 70's a 350cc engine was the wrong size to go for, people, then were wanting bigger OHC engined bikes and a 750 version would probably have been the right size to go for.

Thread: Looking to develop new skills for hobby and work
04/02/2018 19:19:22

Welcome to the forum Ross. I spent 40 odd years working onshore as well as offshore in the Oil Industry,. I take it that you are re-training because of the downturn. My son worked in the industry too but was made redundant after the company he worked for was taken over by Schlumberger. This was also at the start of the downturn and his prospects were pretty poor so I shelled out and lent him the money to train as a commercial Airline Pilot. He is almost there, having gained his CPL and has been taken on by BMI. He starts his Type rating course next week and at the end of it, in five weeks time and providing he passes the exam, should be flying for them full time.

I don't blame anybody within the industry for getting out, I too suffered during the 10 Dollar Barrel price in 2000, being out of work for 14 months. All that happens, when things pick up again, is the pay goes through the roof because every time a lot of skilled people leave the industry never to return.

I hope you are successful in your new chosen feed and get to enjoy our great hobby at the same time.

Thread: Mystery Screws
28/01/2018 14:59:53


they look as though they are designed to hold a ball away from a side outlet on a right angled check valve.

Thread: Lever Operated Collet Closer for the Tormach Rapid Turn
14/01/2018 10:58:33

Thanks Chris, it seems to work well so far. The only really accurate parts to make/modify are the adapter, which is the bright Alloy piece in the picture and the draw tube thread for the collets, other than that it is a relatively simple job to make suitable for the Rapid Turn.

14/01/2018 09:45:41

I have a Tormach PCNC 1100 series Mill for which, when it came out I bought the Rapid Turn lathe accessory that fits to the bed of the mill to become a poor mans CNC lathe.

In order to increase it's usability I made some gang tooling which has so far proven to be worth the effort.

Recently I had an order for 1,575 sensor buttons that were a simple turning job requiring a 3mm slice taken off a 25mm diameter bar with a rough scroll like finish on one face and a parting off finish on the other with chamfers on both edges. The collet closing system that comes with the attachment is draw tube that is tightened and slackened using a 2" long Tommy Bar that fits into holes on the closer tube end. With a cycle time of less than 1 minute it became positively painful tightening and loosening the collet that many times, especially given that the cycle time was less than a minute so I decided to do something about it.

Tormach market a Lever Operated Collet Chuck for their Slant Pro Lathe and I thought I might be able to adapt this for use on the Rapid Turn.

I ordered a unit and it arrived a few days ago so I decided to have a go at getting it to fit. First thing to do was to turn down the draw tube O.D. to suit the Rapid Turn Spindle, next I machined a register on the drive pulley of the Rapid Turn by clamping it to my manual lathe, plugging it in to the power socket on the mill and use the manual lathe cross slide/toolpost with a trepanning tool in it to cut a register in the pulley. With this done I then machined an adaptor to fit the register on the drive pulley and the Index/adaptor of the Lever Operated Closer. The adaptor was drilled to suit the fitting holes in the lever Operated Closer adaptor and the hole centres transferred to the Rapid Turn drive pulley which were then drilled and tapped M^ to suit the mounting cap screws. I then cut the draw tube to length and machined a new thread in the end of it to suit the collets.

Here are the results






Edited By Bob Rodgerson on 14/01/2018 09:48:07

Edited By Bob Rodgerson on 14/01/2018 09:48:52

Thread: Thread Milling
03/01/2018 10:24:14

Steve, that is what I find so good about using the threading wizard in either Fusion 360 or on the conversational programming on the Tormach mill. Adjustments are easily made but in general if I am using a standard recognised screw thread from a wizard it fits perfectly straight off.

02/01/2018 19:30:27

I have milled plenty of threads on my CNC mill but I use the single thread type thread mills. They cost around £50 but work very well.

Thread: Hemingway Westbury Hacksaw
30/12/2017 09:20:46

I hope that Photobucket charging for their services backfires. I have been inundated with messages from them asking me to take up their generous rates since they made this move which suggests to me they are getting desperate for the business.

They obviously made money before charging for their service but have become greedy.

Thread: HMS Queen Elizabeth: Leak found on new aircraft carrier
19/12/2017 10:45:50

I remember a similar experience from my shipbuilding/marine engineering days 19 the early 1970's during sea trials of the ferry St George. She was experiencing severe vibration, especially when in reverse. It was so bad at the aft end of the ship that in some cabins you couldn't stand comfortably, let alone sleep. I seem to recall that we had a job keeping up with water ingress into the shaft tunnel and the bilge pump was running constantly to keep up with it. It was believed that the welds on one of the hull plates had cracked due to the vibration.

The ship was dry docked immediately on return from her trial and a 25 gallon paint tin was found to be caught either around the shaft or between the variable pitch blade and the prop boss. The plate was welded up and on removal the severe vibration was no longer present.

Thread: Brazing Brass
05/12/2017 07:59:45

Hi James,

It may be that the flux is deteriorating due to being held at too high a temperature for too long, though I haven't had experience with this type of flux.

If mixing flux with water use a little washing up liquid in the water, this helps the flux to spread over the metal so that no areas dry up and become bare before heating.

Thread: Runout turning between centres
23/11/2017 12:04:14

I have found that it tends to be the tailstock alignment that causes most grief. If I am turning between centres and the job requires accuracy I set up and run a test on a bar of similar length, adjust the tailstock as required and then without unclamping the tailstock place the workpiece between centres and finish it in one setting.

Thread: First project
22/11/2017 13:59:23

At a guess a 72" wingspan it is likely to be around 1/4 full size. So the spring Oleos will probably be around 3/4" dia

Thread: Barely can spell 'lathe', looking to get into the hobby
12/11/2017 18:15:26

Hi Tom, I believe there is a series aimed at beginners in the hobby. I've no doubt that Neil will be along soon and advise on it. The nice thing about model I.C. engines is that you can make some quite sizeable engines in terms of CC,s using relatively small machine tools. I managed to make a 200cc flat twin using a Myford 3 1/2" and a very basic round column mill.

Thread: Heavy item for use in fidget spinner.
11/11/2017 11:57:20

Depleted Uranium.

Thread: Rotary table problem.
09/11/2017 16:12:58

Not sure if the Centec is a horizontal mill with a vertical head attachment but if it is mount the drill chuck in an arbour and mount the rotary table in the vertical position.

Thread: What have I done wrong??
28/10/2017 12:18:16

I tend to agree with Andrew, hand reaming without a guide is prone to problems. I always try to use a centre held in the tailstock to hold it true while holding the reamer with an adjustable spanner or tap wrench if it will fit on the flats on the end of the reamer while advancing the tailstock. It's a bit od a juggling act but it gets results.

However for really Concentrically accurate work nothing beats working with a go nogo gauge or a pre-prepared mandrel of the desired size and boring to suit.

Thread: How do I check the capacitors on my Warco Mill?
25/10/2017 18:30:56

Hi Brian,

I so far have been unable to trace a circuit diagram or instruction manual. First thing that comes to mind is to do some basic checking such as the plug and the control box to check for wires that may have become loosened be causing a short, beyond that I really don't know where to look.

I am fortunate that I have the CNC mill and it is easy to use, it's just nice to have a manual mill as a back up or spare in case I need to keep something on the CNC mill table.

24/10/2017 07:47:58

Hi Les, I have looked for the manual for the mill but can't find it I'm pretty sure it has a wiring diagram wit it. The fuse blew as soon as I switched on the power and before I actually tried to start the spindle motor. I will see if I can find it.

23/10/2017 21:14:10

Well That didn't work. As soon as I switched on the power the fuse blew yet again

23/10/2017 18:51:16

Hi John,

thanks for the input. it sets somewhere on the motor J.B. that it is a Capacitor start run motor. Judging from the way the two capacitors share one of the wires from the motor would suggest that they are connected in Parallel.

The replacement capacitor looks to be of high quality so hopefully it will work when I replace it .


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