Member postings for Clive Hartland

The diamond wheels should be used for Carbide tooling, HSS tools only need ordinary wheels and then hone with a stone.

How are you going to maintain the radius of cut with this boring bar you have made? Have you clamped a piece of HHS bar in it? If you can adjust its position, then fine, mount it straight in the collet by turning the end of the bar to suit the collet dia.

Clive

The type of adjustable reamer I have has an internal taper that expands the blades. Not like the English adjustable reamer where there are two threaded collars.

The taper adjustment is very fine and allows good true holes, it is surprising how out of round some holes are! The adjustments are very small, only a few 100/ths of a mm but very good for precision work.

Clive

Stuart, I have just had a look at my ML10 hand book, for the ML10 Imp. model, the following gears are listed, numbering 15 gears for metric pitch threads.

1 each of. 21 27 33 36 39 42 48 50 80. 2 off 63.

Further gears are listed, 1 off 40 60 65 85 70 and a 75, these being substituted for fine feeds other than gears listed.

Clive

With my rotary table which has a thimble marked in deg,Min. it is quite difficult to set Sec. in between the 20min scale divisions.

Apart from a Division master is there an easy way of setting the deg/min/sec readings? As at the moment it is just guestimation.

I wish I could fit one of those decimal readers that I had when I was in the Army, they were fitted to Dial sights on the guns and were able to be read to seconds.

Never seen one since.

Clive

Diane, its obvious now from the drawing of the rod/bushing and the pin that there is a 1/64" discepancy in the pin length.

Now its been noted, anyone making Emma Victoria will be wise. Its not a disaster and easily rectified.

Clive

At least John noticed it before he made it ! Did he?

Clive

Sorry, I missed the protusion of the bush ! getting old and see things that are not there.

Hope it all works out John and good job JasonB has his tech hat on. In fact the bush will be 17/64ths in length.

Sitting here looking sheepish.

Clive

Edited By Clive Hartland on 08/02/2013 17:03:41

John, I have looked at the drawings and as you say the leading crank Pin has a pin length of a quarter inch. Now looking at the coupling rod which is 5/16" thick, it has a bronze bush inserted and this leaves a step in the 5/16" wide rod hole because the bronze bush is only a 1/4" long.

The retaining washer is made a loose fit in the Coupling rod hole and is screwed onto the crank pin with a C/S screw. This washer is 7/64ths thick and will in fact be below the surface of the coupling rod.

In normal working tolerances the fit is a very slight end float which will stop any binding of pin and rod.

To my eyes it will all work fine.

Regards, Clive

Im pretty sure that with a vertical slide you can carry out all the operations needed. It does mean a bit more application and you may end up with a stiff neck but you will get there.

Clive

This business of carbide tooling comes up all the time, one thing is that carbide tooling needs a 150% speed increase to cut properly and it must be a good cut. No fine cuts as it will give a poor finish so adjust the tool and work diameter to be very near finished diameter and leave slightly raised steps for bearings and finish those parts with HSS tooling. carbide tooling will remove metal very quickly and save time but only if the lathe/mill is rigid.

Cutting steel with carbide, will if cutting correctly, give blue swarf and its very hot as I have lots of burns on the backs of my hands to show for it.

Also bear in mind that there are different grades of Carbide tips, like P and K which seem suitable for normal work. Unfortunately people see, 'Carbide' and jump straight in thinking its magic and it is not as it requires some knowledge of the types available.

In general, 'Cobalt' tooling is quite adequate for model engineers and Carbide will only be needed occasionally for very hard applications like turning down a milling cutter shank.

Drill shanks are sometimes turned down to fit collets or chucks when you want a large drill but no holder to fit it in. In this case carbide will give a very smooth finish and aid the grip of the drill and chuck.

Clive

A jeweller will often clean a customers gold jewellery with a cloth called a, 'Selvyt' This is filled with jewellers rouge and as it cleans it takes some gold into the cloth. Later the cloth is burnt in a crucible and the gold recovered.

This is very common in the Orient so beware.

Clive

Will, first thing , you do not need to make it like a watch. If you do it will not work. Just make the parts to size and go for it and dont over emphasize on the expansion ratios of the different materiels. The model should be fairly slack and easy to rotate and the piston freely move in the bore.

Just make it accurately and to the drawing and you will succeed.

Clive

A new X3 will come with 4 x machine mounts, these will allow to raise the machine on the bench as you wish.

The space under the machine will of course fill with swarf and be nigh on impossible to keep clear.

It is also somewhere else for round tools to roll under and disappear.

Clive

Put the foot very close to the table and attempt to put a feeler gauge under it in different places and read any differences on the dial.

Clive

Having seen some of these scale models I believe they are made from a white plastic materiel which comes in tubes and squares and sheet and is very easily formed.

I have also seen scale airplanes made this way very realisticly with very fine detail.

Clive

Many moons ago we supplied 'V' belts for compressors, customer asks for one and we supply Shortly he comes back refusing to pay as he can buy the same belt in the local garage for a tenth of the price we asked.

I dont blame him as year on year we added 5% to all spare prices, thats how it worked then. To make a profit we multiplied all prices of spares coming in by 0.58, and that was nearly 40 years ago.

Clive

Edited By Clive Hartland on 27/01/2013 19:49:24

Check the prices, they may be very good but beyond anything I will pay. PROMachine tools have a price list on their web site. £4.590 for the lowest priced milling machine.

If I was paying that money I may as well buy a Golmatic machine.

Clive

Join the club Fizzy, mine had jaws that were sat on a piece of dirt and had then been ground off and when i cleaned the recess it gave 0.7 level error. I had to machine the holes and counterbore the hard jaws to get enough movement to get it level again. Also the slop in the slide movement was bad, I had to re-machine the keep bars and make sure they were the same both sides.

Clive

Surely, as the table is traversed using the wire it will ride up and down the spiral grooves, simples!

So set the cable in the grooves to climb up the spiral in the direction of the table. Also include a stiff spring in the cable to tension it.

Clive

The inflating cartridge on a lifebelt is also banned in flights, you have to remove them before boarding.

If you let the pressure out of these Co2 cartridges then there is the risk of condensation occuring!

Clive