Member postings for colin vercoe

I think they are an iso insert SPKN is the geometry which is an older style of insert so similar to Sandvik SPKN 1204 ED R or L

SPKN =geometry

12 = size of the square

04 = thickness this can vary 03, 04, 05

ED = makers designation for the ground facets ( I think)

R or L = right or left hand

then add the ISO grade of carbide you require eg K20, P40, P20, etc

if you cant get the correct thickness you can always shim between the clamp screw and the insert, you can also use any square insert that will fit in the pocket of the cutter including turning inserts which are much cheaper than ground facet milling inserts hope this helps

Colin

put a parallel bar in vice put a good straight edge or 12" ruler on that, grip in vice cast your eye along the tee slot to the ruler tap until square tighten vice down, practice this and you can get a vice to within .002" by eye every time close enough for most jobs

Thanks for all the information chaps very much appreciated.

Colin

Thanks guys I only want a rough dimension of the height realy as Old Mart says then I will make a couple from plate.

cheers Colin.

Hi

Can anyone here tell me the dimensions of the factory made riser blocks for the Myford ML10 lathe please, thanks.

I never used tennons as they dont give reliable accuracy, you would still have to check with a dial gauge, I place a parallel bar in the vice then a steel ruler on top and grip in the vice then eye the edge of the ruler with a tee slot this will with practice get you within a couple of thou every time then finish with a dial gauge.

If you have a 4 1/2" grinder better still a battery one this is probably the industry standard now for jobbing shops and site contract work for steels, cast iron pipe, stainless steel pipe, and sheet use a stainless steel or Inox grade for all as this is a good general purpose grade, grind with a gentle forward and back motion a bit like a surface grinder light pressure dont dwell in one spot or heat will build up causing wheel to glaze this method will fly through 2.5mm sheet, we regularly cut 3mm stainless sheet or pipe up to 6 - 800 mm long.

The pinion and on off lever wear out because of the particles of swarf etc in the keyways gets carried into these items as the machine is in use both being under load as the machine is working etc, bear in mind this is an industrial machine and has probably had a lot of use, I would think a good fix on this would last for years with light home use, it needs to be a good fix, make the new key as long as possible but more importantly a good fit into the pinion and secure or it will roll over in the keyway and jam or come out if you can tack in place or braze, also check the keyway for size as these wear as well, if worn and you have access to a milling machine clean up the keyway and make your key oversize, when repaired correctly these will last as long as the originals.

The Colchester lathe drive pinion and the on off lever dont have a separate key the bore of the pinion and the on off lever are broached to form the bore and key all in one piece if that makes sense so no separate key and they will wear away completely in time but they can be fixed by milling a slot through and fitting a key from the rear if that makes sense and tig weld in place, this is the same with all Colchester lathes, if you can pick up a spare worn item and fix it prior to yours wearing out, great as a spare because they always give up when you need them most. Good luck!

For dressing cup, dish, or wheels for general sharpening end mills slot drills lathe tools, etc just dress free hand this gives a much more open wheel and dosnt burn the tool, general tool sharpening slot drills etc you only want to be cutting on a very small corner area of the wheel, slightly rotate the wheel axis so as not to grind on the back of the wheel as you pass the wheel if that makes sense. Brace yourself against the machine hold the dresser firmly and dress the wheel almost like using a wood turning tool until the desired shape is achieved. For dressing the wheel for surface grinding etc as previously mentioned mount the dresser onto a mag base or similar with the diamond at an angle about 5 degrees just past the centre line of the wheel and pointing away from the direction of rotation of the wheel lock the table then it will push away if you dig in

I sold mine on the lathes.co.uk website

The item shown is an Asquith tap collet for use in Asquith tapping chucks, the tap is clamped into the collet buy the side locking screw, as for the stamping 6 ISO denotes the size of tap M6 with an ISO shank, there are various shank sizes available on all taps eg BS 949, ISO, etc The clever part with these collets is the spacing collar at the other end of the collet the thickness of this varies to suit the size of tap M8, 10, 12, etc being thicker M2, 3, 4, 5, all different and thinner the thickness of the collar engages the driving dogs inside of the chuck giving varying degrees of driving force to suit the various tap sizes, the tapping chuck has different settings on the body for Aluminium, Brass, Cast Iron, and Steel, once set at the metal being tapped the chuck will slip at that setting when the tap is bottomed out whatever size of tap is being used without breakage or adjustment, the collets are also available with morse tapers for drilling reaming etc with a much thicker collar at the end giving no slip of the drive clutch, the collar at the end on the tap collets is floating to allow for spindle float when tapping, the collet is driven by the two flats on the shank, used mainly on manual drilling machines collets could be changed without stopping the spindle.

Try it with the jaws further towards the closed position, and press out from the front end.

Lengths of standard size Acme threaded bar are available to buy also bronze nuts to fit

stainless in aluminium can cause the aluminium to corrode away especially if subject to wet and salt etc, if you use stainless you should also use nylon isolation washers.

I think spoke threads are rolled and not cut for strength

There is a pallet truck available that will lift 500kg from about 80mm and lift to about a metre, they are safe and controllable you can hire them from Brandon tool hire etc

Oil under the vice etc with WD 40 will help reduce staining of the table if left bolted down for long periods

Hi

It looks to me that you have the tool in the head the wrong way around, the clamping screw usually clamps down on the top of the boring bar and pushes the bar down into its seat, you feed the bar out to the right as we are looking at it, you have the tool upside down and facing the wrong way also the cutting tip needs to be on centre to the feed out axis if that makes any sense, a high speed steel tool will cut well on this material at the speeds stated with cutting fluid as mentioned above.

cheers Colin.

I would go for three flute cutters as a general all round cutter as they can be used as an end mill and a slot drill and give great results for both operations.

Colin