Indholdsfortegnelse for October 2023 i Model Engineer & Workshop

EDITORIAL Editor: NeilWyatt Designer: DruckMedia Pvt. Ltd. Publisher: Steve O'Hara By post: Model Engineers’ Workshop, Mortons Media Group,Media Centre, Morton Way, Horncastle, Lincs LN9 6JR Tel: 01507 529589 Fax: 01507 371006 Email:meweditor@mortons.co.uk © 2022MortonsMedia ISSN0033-8923 CUSTOMER SERVICES General Queries & Back Issues 01507 529529 Monday-Friday: 8.30-5pm Answerphone 24hr ADVERTISING Group advertisingmanager: Sue Keily Advertising: Angela Price aprice@mortons.co.uk Tel: 01507 529411 By Post: Model Engineers'Workshop advertising, Mortons Media Group,Media Centre, Morton Way, Horncastle, Lincs LN9 6JR PUBLISHING Sales and Distribution Manager: Carl Smith Marketing Manager: Charlotte Park Commercial Director: Nigel Hole Publishing Director: Dan Savage Published by: Mortons Media Group, Media Centre,Morton Way, Horncastle, Lincs LN9 6JR…

…some engineers’ blue? Brian Wood shares some useful ideas for the workshop. I approached the Editor recently with a couple of tips for publication in MEW, completely unaware of being the winner in a previous offering that was about to be issued. I was asked nicely to accept a different method for these to be published in Scribe a Line to avoid being labelled as ‘hogging the slot’ to which of course I agreed. It setme thinking though as there are several more of these considered worthy of passing on and this is the result; a mixed bag of dodges and the like to be going on with. Tricks with woodscrews To shift tight woodscrews that have rusted into the woodwork over the years, my father used to belt the…

The performance of the mk4 tangential flycutter, photo 1, was still not as good as was desired, so further thought was given to the matter. In the interests of simplifying machining, the mk. 4 tool holder had been made with a full-length trapezoidal shank. It seemed very likely that this was a feature which could allow the holder to tip and upset the intended tool geometry. Since this was effectively a righthand tangential turning tool for a lathe, possibly a left-hand version would solve the problem? Work was putin hand to produce a left hand toolholder, but by milling at compound angles, machining just a short distance at the end of the holder shankto a trapezium shape. This would entail widening the slot in the tool holder block, to accommodate…

As regular readers will be aware, Model Engineers’ Workshop and its sister publication Model Engineer are teaming up with the Society of Model and Experimental Engineers to celebrate our joint 125th birthday in 2023. To mark the occasion we will be attending the Midlands Model Engineering Exhibition, organised by Meridienne Exhibitions. News from Meridienne We look forward to welcoming you to the 2023 Midlands Model Engineering Exhibition, sponsored by Engineering in Miniature – One of The Premier Modelling Events in the UK. We will have hundreds of models on display including locomotives, rolling stock, traction, stationary and hot air engines, boats, along with workshop equipment and clocks – virtually every interest will be represented. There will be over a thousand models on display for your enjoyment on nearly 30 club…

TIPS OF THE MONTH WINNER! Hall Effect Gear Tooth Sensor. This month's winner is Keith Fisk of New Zealand with a suggestion for a reliable device for a lathe speed sensor. From time to time, as in MEW 325,1 see articles published for lathe speed sensors. All the designs I recall seeing have either a magnet fitted to the outboard end of the headstock spindle and a proximity sensor, ora slotted disk with an optical sensor. Several years ago I fitted a VFD to my Myford ML7 (Tri-leva) and made my own tacho. I took a slightly different approach and used a Hall Effect gear tooth sensor aimed at the bull gear – no additional magnet or slotted disk required. Hall Effect geartooth sensors are commonly used in the automotive…

A Mystery Tool I know what this ‘mystery’ tool is, as I bought it. In fact, I had to order it from the United States! I could have made one, but despite its simplicity, it would have needed to be bent up froma larger piece of stainless steel, a material that is a right pain towork neatly and a good smooth finish is essential. Now, I'msure many readers will be able to guess it's basic function (no, it isn't a tire lever!) but how many of you can say exactly what the purpose of this little object is? A Steady Hand I was given a nice microphone, but the capsule in it had an intermittent fault. Eventually gave up on tracking it down and ordered a couple of mid-range capsules…

More On Old Woodscrews DearNeil, please see her a picture of awood screw. In our ancient house (‘new’ wing built about 1830) some of the doors are of ‘Georgian’ era. This screw is from one of the door hinges. I cannot remember the year, but wood screws were first made without a point, like these, you will note it has only a very slight taper so a pilot hole would need to be drilled. It was only sometime later, sorry don't know the date, when they were able to make them with a point on so they resemble modern wood screws. I hope this adds to the shared knowledge of the discussion. William Waddilove, by email. Magnetic Attraction Dear Neil, I recently had need to make a 3 inch diameter…

OCCASIONALLY in assembly work, only familiarity with some “ dodge ” or other enables a screw, bolt, or nut to be fitted without a great deal of frustration and loss of time. Much the same is true if a screw or small component is dropped in an in-accessible position. Small screws and components can be handled effectively with tweezers, and medium-sized ones with long thin-jawed pliers; and there are various means of maintaining screws on screwdrivers. It the screw slot and screwdriver blade are both good, and the screw is to be pushed into a horizontal or overhead hole, it can be done by simply placing the screw oil the blade. If the hole is substantially downwards. however, the screw will fall off unless held in sonic manner. To do…

Let's resume making the Ferguson's Paradox device. The screws are not shown on fig 2, but they are described in the part list with the ISO designation for shape and material. Another puzzling gear set can be made, using a gearset having 29 teeth for each gear (profile shifted) associated with the gearset having 30 teeth for each gear (same module m= 1 for all the gears) see photo 6, all the gears are running at the same speed but the gears teeth seem to move one aside the others, see photo 7 giving a side view. Details for the two new 29 teeth wheels: da =32.1; Wk = 14.06; x = 0.55 A left click on “?” in the bottom menu shows you the cutting rack and pinion definition,…

I took delivery of my Emco Maximat Super 11 in 1986. At that time this was only one of two lathes in the model engineering world that came with a handwheel dial as standard. The other being the Myford 254 lathe. Having this luxury was something I had grown up with in industry, but the 19mm per revolution graduation was a bit of a disappointment. Nonetheless I soon became used to some quick mental arithmetic to get all those desired dimensions above 19mm that I wanted. There had always been an intention to remedy this shortfall but somehow, Carriage handwheel and dial just visible. I never seemed to get around to it. Matters came to a head thirty years later when a series of mental arithmetic mistakes, which resulted in several…

On one occasion I wanted to machine a vee groove in a piece of steel. The piece had a number of projections on the back that made it difficult to clamp securely in my tilting vice due to the narrow jaws. I ended up making several special packing pieces to get a stable clamping in the vice jaws and was able to mill the vee groove. After I had finished the job, I started thinking how much easier the job would have been if I had a tilting table with tee slots. With a few clamps and some jacking screws in the workpiece it would have been very easy to set up. I started to think about making a tilting table from scratch. I even started to draw up a…

Aset of radius gauges is extremely useful when there are radii to be cut. Imperial, photo 1, and metric sets are available, and they can often be found online. Small concave radii, such as that at the root of a wheel flange, can be produced easily by grinding a carbidetipped or HSS round-nosed lathe tool to the desired radius. Recently, tools with replaceable circular carbide tips have become available but you will be very fortunate if you are able to find a tip with the exact radius to be cut. A selection of useful lathe tools is shown in photo 2. The lathe will complain when a profile tool cuts along an extended edge. This can be minimised by either using the lowest back gear speed or by turning the…