Here is a list of all the postings Graham Meek has made in our forums. Click on a thread name to jump to the thread.
|Thread: Electric Smart Meters|
I have been reading through this post since our Smart Meter went off-line on the same day as this thread was started.
I have to admit I did consider some of the posts were a little sceptical verging on paranoia. That was until the meter decided to come back on-line late last night, but Gas only.
The total consumption for yesterday was £1.45, this is for 35.42 kWh used. This gives a unit cost of 4.093p per kWh.
The Tariff shown on the device is 3.36p per kWh, so as a calculator the multiplication is off.
My Tariff for Gas is 3.207p per kWh. This morning first thing and using the same maths we have 14.45p per kWh, currently we are at 10.61p. If it is malfunctioning then how long has it been like this, and how can one be sure of its accuracy in the actual consumption used.
Obviously as a meter these things are useless, and I have to admit the scepticism is well founded. Small wonder I have a preference for all things mechanical.
Edited By Graham Meek on 15/10/2020 12:08:26
We had one fitted just over twelve months ago. The not so Smart Meter is currently "waiting for current information", ie, it is not working.
This is the second time in a month this unit has gone into this mode. I have tried all the "recommended Fixes" but it has made no difference, this time. Time to contact the supplier, and there-in lies another story.
|Thread: Very stiff Emco FB2 quill|
I also intended to post this yesterday but was called away.
One other source of noise and possible damage to the gears, is the setting of the 3 position Speed Selector. If this is initially set in the lowest position, (I), then the gears in this range can be meshing by only 1/2 a tooth width. It is better to set the selector in the fully up position, (III), and then check the engagement at the lowest setting.
The recommendation in my 1996 manual says to use the same oil as the slideway, ISO VG 68. As the machine came filled with Castro Hyspin ISO 46 Hydraulic oil, and I have a good supply of this, I have continued to use this. In one machine I did try a multigrade synthetic transmission oil. The only down side to this was the smell which would come out of my vent valve during use. I detected no change of noise level using this oil.
I was not keen on using a straight oil, like the slideway oil, because this can cause foaming in the gearbox. Most hydraulic oils have foaming inhibitors, and some are better than others. The foaming will make the oil circulation pump less effective and slow down the circulation of the oil to the upper bearings.
Overfilling the gearbox can make it noisier, due to the pumping action of the gears, (more oil means more gears rotating in the sump due to the increased oil level). Emco recommend the oil level to be halfway up the sight gauge.
Glad to hear your spindle was not damaged,
Edited By Graham Meek on 08/10/2020 11:01:56
The actual EMCO Quill drawing states a tolerance of g5 on the 52 mm diameter. This in terms of a measurement is -0.01 / -0.023 mm, or minus 4 to 9 tenths of a Thou.
Emco in their infinite wisdom specify a chamfer of 0.4 x 45 degrees at each end of the slot to try and mitigate burrs at this point from affecting the sliding fit.
I have just been reading through your opening post for the first time today, As soon as I read you lowered the Quill in your attempt to extract the taper, I knew what had happened.
There is bound to be damage at the top of the Quill Guide slot as Henk shows above, but may be not as bad as that shown. You may have also damaged the locating bolt end where it fits into this slot. It may even be bent, and so may be rubbing on the bottom of the guide slot as there is not a lot of clearance here.
I suspect also that you will have damaged the Ball races in the Quill itself due to the hammering. Beware the circular nut in the centre of the quill is a LH thread, should you decide to take this apart. Unfortunately the ball races are not standard issue. They are specially made for Emco, in that they have to be assembled with the faces marked abutting. This takes out any end play in the races. Replacing these with standard races will probably lead to some play in the spindle vertically.
Hope these notes help,
|Thread: Martin Cleeve Swing Clear Retracting Toolholder|
I remember assisting Dr John Beddard with some technical details of the Prototype for Hemingway's on the Martin Cleeve Retracting Tool Holder. I know this was after Neil Hemingway sold the business, someone Lyons springs to mind. John may have even written it up for SMEE at the time.
The Toolholder was listed with Hemingway's, as I remember the photographs that were used which were taken by John. I also seem to recall some 3D views of this somewhere, may-be the front cover of Martin's book.
The basic mode of operation was an eccentric in the tool block which initially retracted the tool. I cannot remember if the handle would also swing the tool clear, or if this was a separate manual operation.
|Thread: Emco FB2 Quirks and Additions|
I am glad you like this post, and good luck with the modifications. I have certainly learnt a few things from other contributors regarding the clones.
Edited By Graham Meek on 30/09/2020 18:07:50
Thanks for the update, it is nice to get some feed back that verifies the above drawing, other than just my memory. It is also good to know the Motor Pinion tooth count, as to date I have not counted this. My own mill from Austria was manufactured in1996. I was told it was one of the last to be produced, how true that is I do not know.
I am not familiar with the make of your machine. I have seen advertised non-Emco replacement gears of both 45 teeth and 47 teeth from the same supplier. The price was eye watering and dearer than a genuine Emco.
I was bemused with the title of the gear in the Parts Handbook as being Gear 47. The last time I had my machine apart I did count the number of teeth on my Tufnol gear, and it is 45 teeth. The Outside diameter being 60,2 mm. I have also just counted around the not very good image on Pro-Machine Tools web-site and I make that 45 to 46T, but not 47T.
I did wonder in the mix of these machines if Emco used a higher number of teeth on those machines fitted with 60 cycle , Hz, motors. However having just worked through the increase in rotational speed of the 60 Hz motor. The speed advisory plate for these machines comes out as one would expect, using the same gearing as a 50 Hz motor.
The only other reasonable explanation is that it was originally 47T, but due to breakages the tooth count was reduced to 45T thereby producing a stronger gear. It would be interesting to know if a 45T will run in a 47T machine, as this would prove it.
Thus I too am at a loss as to why these gears are different. If anyone has the real reason for this conundrum I would be glad to hear it. I do not like sending anyone off on a wild goose chase.
|Thread: HSS/Tungsten Tool Honing Machine|
We were using Structural Aluminium to build tooling back in the early 90's.
This ranged from Robotised assembly tools that completely assembled things like the indicator and headlamp stalks for Audi and Ford cars. Various smaller items like door switches for Toyota and Ford. As well as Micro Chip handling units. The movement of Compact discs from the moulding press through metalizing, lacquering, printing and packaging. The complete manufacture of friction window stays from raw material through pressing, to assembly and packaging. Plus the assembly of Carbon Fibre segments which would eventually become disc brakes for Aircraft. All were based on structural aluminium systems, like Bosch Rexroth, but there are others.
Many of the specialist pieces of equipment used in Radiotherapy were also built using these systems, but I cannot divulge anything about these machines.
An article is already underway. The Editor of Home Shop Machinist, George Bulliss expressed an interest in this machine as soon as he saw John Slater's 3D views some months back.
I cannot say whether this will get published over here at this moment in time.
This is the first of a pair of machines which I am working on. The second is a Rotary Hone / Lap for doing a range of bores. This design comes off the back of a novel way of adjusting a lapping tool, which I made a while back to finish the bores of my Steam Wagon. This second machine is still at the design stage, and hopefully John Slater will do some 3D views of this later in the year.
Unfortunately it will be another Aluminium construction for the main body,
They say beauty is in the eye of the beholder, in my book Aluminium looks good and is more than adequate for the job in hand. Plus it is a darn site cleaner to machine than Cast Iron, as well as being kinder on the tooling and the machines.
If the "Purist" want to change things to suit themselves that is OK by me. In fact I am happy when someone takes one of my designs and modifies it to suit their needs.
As regards exhibitions I only visit, never enter, so I won't have to worry about winning, or not winning anything.
The Riveting technique is one I have used for a number of years. It is another technique picked up in the Training School when we made all our own kit. By using a bearing ball the material will flow far easier due to the excellent surface finish on the ball. Whilst the use of an Arbor Press to do the operation allows the operator to feel the material give during the clinching and then go solid when it is fully home. The cost of one bearing ball is peanuts compared to spin rivet tooling.
This is the separate table that is used to form the Radii on the tools. The centre for the table and sector radius is the face of the slip stone, or hone.
This shows the Fixture parts for setting the radius. I will leave the setting of this fixture until I have finished the fixture. A picture will save me a thousand words describing how the fixture is used. Suffice to say this fixture automatically sets the tool at the correct radius and centralises it in one go.
Thank you both for your kind words.
I blame my apprenticeship with the Dowty Group as regards having to get everything right. Being part of the Aircraft Industry it had to be right, there are no lay-by's at 40.000 feet. Still their training stood me in good stead as a Toolmaker for 30+ years. Then later getting things right, and the education paid dividends while working for the Oncology Workshops at Cheltenham. Where we would see the effect of our work on patients.
|Thread: Emco FB2 Quirks and Additions|
A recent inspection of the internals of the Milling Head gearbox showed the teeth on one side of the Sliding Gear showing signs of distress.
Knowing the Gasket or Seal 3 was getting a little ropey on my machine I decided to order one of these along with the replacement gear. Unfortunately since I looked the last time these seals are no longer made. However an email to EMCO in Austria, provided a drawing of the Seal 3.
Cutting gaskets by hand has never been my strong point. To make things easier for me I decided to make a drawing of the Seal so that I could use the same hole cutter used for the bolt holes, to also cut all the intersections. As a hand cut gasket I was pleased with the results. It was just a case of laying a rule as a tangent to each hole and cutting through with a craft knife. Sort of Dot to Dot. The holes at each corner not only make the gasket stronger, but take away the awkward niggle of not having cut into the corner enough with the craft knife.
Making the Silver steel cutter and the gaskets took about just over an hour.
Two gaskets can be had out of one A4 sheet of gasket material, so I took the opportunity to make two of them. The second is inside the machine cupboard door, taped to the door in a plastic bag just in case the next owner needs it.
I think the photograph above illustrates the technique used. If there is sufficient interest for this drawing I will make it available as a PDF, with Neil's blessing and help.
Edited By Graham Meek on 15/09/2020 15:24:51
|Thread: HSS/Tungsten Tool Honing Machine|
As promised a few days back here are some more shots of the Lathe Tool Honing Machine,
This view differs from the previous one in that a Guard has been added to the Rt hand side. With the stone rotating clockwise there was a distinct pinch hazard.
This second view shows several things,
First is the Spring loading that automatically retracts the table and also automatically locates the interchangeable tables in position for locking. The nature of the clamping mechanism means the complete table with the tool still set up can be removed for closer inspection with no loss of positional settings.
Secondly is the two position Deadstop. The primary use of the deadstop is when doing radii with the additional table, (more on that later). It also stops any collision between the edge of the table and the Slip stone.
This view shows the Deadstop in position 2, the hole in the stop allows the table to be advanced by a measured amount past the datum position by using the adjustable stop. The graduations on the collar of the adjustable stop can be seen in the first photograph. This collar is only graduated with 10 of the full compliment of 40 divisions as each division is 0.025 mm or 0.001". I could not foresee a need for removing 1 mm with a hone.
A Rear view of the machine showing the drive to the two cranks. The belt is kept in check by a cutout in one of the Motor support pillars so no washers are needed on the pulleys. The graduations on the degree scale can be seen in this view.
This view shows the second table in position for doing the radii, but as yet not fully machined. The felt tip marker traces out a semicircular cut-out to take the tool bit holder. The details of which will be posted soon.
Edited By Graham Meek on 15/09/2020 14:57:15
|Thread: Facing parallel between centres.|
I could not have put it better myself,
"Facing parallel between centres" is the title of this post. Failure to get a good result is hardly a claim that "it does not work". Especially if the methodology of this process is not fully understood.
I do wonder how much of the of the aversion to this "between centres process", is based on disturbing the tailstock setting. It has always been a big No, No, with some individuals. The same is true when it comes to moving the topslide, when anyone advocates the set over top-slide method of Screwcutting.
Those who know their machine tool history, will know, " Dead Centres" were the basis of all turned work at one time. It was not until later on that the "Live Mandrel" was developed and the faceplate became available. Dead Centres are still used in cylindrical grinding, for most work. The lathe Mandrel on the lathe in the picture above was no doubt finished this way.
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