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Member postings for mick

Here is a list of all the postings mick has made in our forums. Click on a thread name to jump to the thread.

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Thread: Why are milling machines so b****y expensive
03/12/2011 15:50:26
I've had an Axminster mill/drill for five years, which cost under £500, I think the price is still pretty much the same today. The machine is solid, the slides are good and the fine quill feed is exceptable, but you will need some kind of digtial readout on all three axis to machine any thing accurate. The machine has done everything I've ever asked of it. Be warned conventinual milling was a five year apprenticeship, so just buying a mill without any practicial experience there might be tears before bedtime!!
Thread: metric taps
23/11/2011 08:14:01
British Standard tapping sizes give about 75% engagement, but for materials like stainless steel and other tensile metals you are allowed up to 50% in order to give the tap a fightinging chance. These relaxed tapping sizes are in constant use for smaller diameters in the high vacuum industary, where all machining standards are extreamly high.
Thread: How do I
18/11/2011 17:13:32
If you don't have access to all the kit described and you do have a simple drilling vice with a horizontal V groove and your bench drill has a round table which coupled with the main support arm allows you to position a component any within the 360 degree arc, then clamp the vice to the table with the bar also securely clamped. Put a centre drill in the chuck with the bar directly beneath the spindle, place a thin, but flat strip of metal on top of the bar and bring the centre down till it holds the strip. Depending on which side of the bar isn't directly uder the centre line of the spindle, the strip will dip to one side. The centre line of the bar is directly under the centre line of the spindle when the strip is completely horizontal.
Thread: Tapmatic Help
28/10/2011 18:51:47
Sprial fluted machine taps for blind holes, sprial point machine taps for through holes. Its been a while since I used a tapmatic head, but as I remember the tourque settings are adjusted by the ring on the top of the body, depth and auto reverse are engaged by the spindle stop as a normal tapping head. If you can get hold of some tapmatic Gold tapping fluid it makes the tapping twice as easy.
Thread: Drilling in the mill
24/10/2011 16:58:54
I use a mill/drill which cost under £500.0 new, with a set of digital scales fixed to all three axis its done every thing I've asked it to do for the past four years
Thread: Using a boring head to set over for taper turning
23/10/2011 15:39:44
Turn one out of silver steel, which will be a size fit to your boring head, then harden and temper to avoid wear. I've never used a boring head to this effect, it sounds fraught with dangers, what if the boring head slips in the tail stock spindle, which I imagine would take the whole assembly below the central axis of the machine, far better to set the tail stock over, you can't go wrong that way, but good luck

Edited By mick on 23/10/2011 15:40:16

Thread: MEW 182 - Wot no ...
02/10/2011 16:46:41
OK, I don't have a copy of MEW but I supplied a diagram of two identicial components with a through bore, I said that it would be brittle if squeezed. Put that component in a vice and squeeze it and see what happens, it will break. Put the other one in the vice and squeeze with the same amount of pressure, the likely hood that it might distort are quite high, but it won't break. The point being don't clamp castings across thin sections as they will snap, because they are brittle.
02/10/2011 13:00:17
Hi. Peter.
Its not a new kind of slip gauge, rather one of the oldest still in every day use!
Still in the shelter, as I expect some more incoming, but its nice to hear a bit of friendly fire as well.
Regards.
Mick
01/10/2011 16:28:53
I thought I'd attract a bit of attention when I poked my head over the parapet by started on this discussion, sorry about the slip of the key board, that was an honset "slip" There are too many grades of steel to describe the carbon content of each. The broad descriptions of a grade of steel has to fall between two set figures, in general terms these may overlap. The object of the carbon percentages was to demonstrate, that only the smallest amounts of carbon can alter the machinability of steel, which I was hoping might encourage the novice machinist, who might feel that the finish and any difficulty experienced in machining was something they were doing wrong, but might have a great deal to do with the material they were using. Still back to the shelter.
Thread: Square holes
15/09/2011 17:47:40
Hi. All.
Perhaps we're looking at this problem from the wrong direction. The amount of heat required to silver solder the fabrication would certainly be enought to make it bend like a banana.
I think it would be nigh on impossible to cut a 5/16th square cleanly through an inch and a half of 3/8th squ. MS even if you could hold it you would need an industrial broach and these are quite long, you would also need a decent size fly press.
The only way I can see is to get an industrial workshop to cut the squ in a larger section, at least 5/8th. Then produce a 5/16th squ packing piece that is a decent push fit to the broached squ. then mill the service stock away to produce the 3/8 squ. then remove the packing, but I would think even this approach would distort the section.
I can't imagine what this is for, but its an awful lot of trouble to achive.
Thread: Removing Clarkson chuck
24/08/2011 14:45:37
I've never come across this style of securing a milling chuck in over 45 years in the trade! All I can suggest is the screwed ring may be a way of breaking the taper, as its got tommy bar holes, can you move this ring in any direction? The complete assembly might be held on an international or moorse taper, to find out give the loosened draw bar a sharp crack with a copper mallet, which should break any holding taper. If that doesn't have any any effect I'd proberly leave well alone.
Thread: Michael Cox Tangential Tool Holder- MEW 179
22/08/2011 17:18:31
The ground angled face on HSS tool bits was always intended to be a front clearance angle to save you grinding one on, at least thats what I was told by my instructer, although I've always thought it to be too much, as 8 to 10 degrees is considered to be about right. The more top rake you apply to a finishing tool, the better the surface finish, so if your tool bit's rake angle is indeed the front angle, this might explain it, as all the cutting edges are in fact factory ground, which is a far smoother edge that most workshop regrinds can produce.
Thread: Myford online auction
16/08/2011 09:29:57
I would like to associate myself with the last comment. I bought the vast majority of my kit at auction when I started a small engineering concern in the eighties. On quite a few occassions I've seen "Joe Public" pay more for second hand small tooling than the brand new price. You will be bidding against the trade, the only real bargin will be the bid after the machine dealers drop out, but remember they pass on the VAT. Auctions are great and can be really exciting when your bidding against others, the trick is to keep a realistic price in mind AND STICK TO IT. As a previous post pointed out, you will be paying an extra 35% on the winning bid and will have to collect your win. If you are going to bid, good luck
Thread: An IC engine project for a tenner?
14/08/2011 18:03:34
serious I/C dudes or scrap metal merchants?
Thread: MEW180 CAD Article
11/08/2011 11:14:48
Hi Andy.
The ram will always return at twice the speed of the forward stroke. I can tell you from personnel experience that the Shaper was still a popular workshop machine well into the eighties, but mainly by those who knew how to use it to it's full potetional. I had one in my own comercial workshop into the late nineties. There is no better machine to achieve a totaly flat surface and can easilly be set up to cut key ways, only wish I had room in my workshop (shed) to fit one like yours in, thats of course if I could locate one, enjoy it, I've always maitained that god didn't rest on the 7th day, he invented the shaping machine!!!!
Thread: Indexable tooling
09/08/2011 14:10:50
Is this a cam lock or counter sunk screw type? If cam lock are you tightining the cam in the correction direction
Thread: Coolant
05/08/2011 08:58:10
Hi. Jim.
Just write a short programme that will turn the spindle and coolant on and run it a couple of times a week for about 5 minutes or so, its only when the coolant is allowed to stagnate that it goes off
04/08/2011 18:42:52
Back when god was a boy, soluable would go off over night, now it has addatives that prevent it doing so. Soluable shouldn't go off these days, only if you don't use it for months on end, then maybe. Always a good idea to mix water to oil rather than oil to water. Perhaps your mixing it in the wrong ratio, shouldn't be below 40:1 for general workshop use too strong a mix may become solid and lumpy. the only real alternative is mineral oil and that is messey
Thread: Don't assume the obvious
02/08/2011 08:21:45
I call my workshop (shed) The Liberal Party. If anybody phones up and asks to speak to me, my wife tells them I'm in The Liberal Party and they never call back!!
Thread: Scribe a Line Kitchen Knife Sharpening
27/07/2011 18:23:18
although I own various oil stones and diamond laps, not to mention an off hand grinder, the only knife I use on a regular basis is the carving knife on Sundays and like my father before me I sharpen it on the back door step before I start carving the roast, it cuts like a dream.
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