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Member postings for Simon Williams 3

Here is a list of all the postings Simon Williams 3 has made in our forums. Click on a thread name to jump to the thread.

Thread: Sigh, practicing a skill I would rather not need
18/04/2022 18:43:04

I've learned quite a lot out of this saga, only sorry that it has to be at the expense of progress. But it does strike me that there is the makings of a magazine article in the art of tap removal/carbide drilling here.

I look forward to it.

Rgds Simon

Thread: Need a pen to draw the "finest possible" lines?
18/04/2022 10:56:57

Nobody's yet mentioned Graphos, which is a pen body/replaceable nib system using indian ink or equivalent. There are some really really fine tip nibs available.

I fancy it's obsolete, but there are some examples on ebay.

HTH Simon

Thread: RS Components Datasheets
16/04/2022 09:44:30

Dunno if it helps, but I've got three of these kits albeit with a different part number here, RS 805-114. I've no idea if I've still got the data sheet, but if they are any use to you they're yours for the cost of postage.

PM me if it's of interest to you.

Oh and I'm in North Gloucestershire nearly Monmouth btw.

Rgds Simon

Thread: Imperial v Metric Measures
09/04/2022 20:08:59

Count your blessings chaps.

Having three systems of measurement gives me a cast iron (well, chrome vanadium actually) reason why I have to have THREE sets of shiny new spanners. Three sets gotta be more fun than just one, eh?

edit for minor typo

Edited By Simon Williams 3 on 09/04/2022 20:10:03

Thread: Myford Super 7 QC gearbox Mk1 problem
04/04/2022 19:03:55

Shingles...

Oh dear Brian that's a rotten stroke of misfortune! I/m sorry to hear that you have found yourself suffering that turn of events. My wife had shingles in her thigh/hip some while ago - your misfortune is not alleviated by my rehearsing her tribulations but I do sympathise.

Do get well soon.

My very best wishes

Simon

03/04/2022 08:53:49

<BUMP>

Anyone got a copy of the older model gearbox drawings?

I'm out for the day - but I think I've only got the newer document anyway.

Rgds Simon

Thread: Gear cutting basics help needed.
02/04/2022 22:49:42

My thanks as ever to Michael Gilligan, whose recommendations for further research by the student proved to be fascinating and educational.

Best rgds Simon

02/04/2022 16:55:14

Am I right in thinking that the reason involute gears aren't used by and large in clocks is that the very small pinions (6 and 8 teeth) beloved of compact clock designs need undercut teeth to follow the correct involute shape. Undercut teeth are weak and impossible to cut with a rotary milling cutter, they have to be planed.

Fact or fiction?

By the by, I built a clock using 20 DP involute gears - that was the set of cutters I had available. To be strictly accurate I was building the 12:1 gear train from the minute hand to the hour hand on the local church clock, so space wasn't an issue. The minute hand is driven by a synchronous motor rotating once per hour, and obviously the hour hand is coaxial. Thus the 12:1 reduction driving the hour hand is equivalent to the back ear on a lathe headstock a la Myford etc. As I say, space was not a consideration but longevity is a point of honour!

01/04/2022 16:12:32

Some oddities here methinks.

Firstly why is one gear 42DP the other 3 are 34DP. These won't mesh together - are they meant to?

Secondly I could imagine 32 DP is a standard size cutter, (|I see RDG advertises same) but AFAIK 34 and 42 ain't - standard cutters would offer 36 DP and 48 DP. Are cutters even available in 34 and 42 DP? And Howard's question about pressure angle is valid.

Thirdly this is for a clock. Would one expect the tooth form to be involute (i.e. use standard cutters)? If they are cycloidal that's a whole different can o' worms.

Can we please have some indication of where these numbers came from just to avoid perhaps leading you up the garden path?

Thread: 46mm tube
29/03/2022 22:00:29

I'm "fairly" sure it is actually 40 mm bore cold drawn hydraulic tube, as used for making 40 mm diameter hydraulic actuators (cylinders). So 40 mm bore, 3 mm wall thickness. Probably honed internally, though if you were buying a lot of it you'd probably forgo the honing process.

If you can find a local company re-manufacturing hydraulic cylinders they'll likely have a scratched piece in the scrap bin.

HTH Simon

Thread: Is this 3 phase motor suitable for delta/VFD?
25/03/2022 10:31:41

Usual Health and Safety warning when working with mains power, but be aware a 400V shock is much nastier than ordinary mains. Never work on live wiring and make sure the connections are understood etc.

Dave

Sorry Dave, can't let that one pass.

400 volts (line to line) is the same thing as 230 volts (line to neutral).

Three phase motor suitable for 400 v line to line in star needs 230 volts line to line in delta so only 133 volts line to neutral. It's the line to neutral (earth) voltage that bites you, you'd have to try hard to grab two phases simultaneously.

However VSD outputs aren't necessarily symmetrical about earth.

Thread: FAULTY DRILL BITS !
15/03/2022 10:50:25

'ang on chaps, we've got lost in the brambles somehow.

The OP's (and his friend's) original query was "why do my (expensive) (Presto cobalt) drills not cut at all?"

Notwithstanding the niceties of whether these sets of drills are overpriced, on the face of it they ought to at least cut holes when offered up to a bit of steel or aluminium. But they don't, or so is reported.

So can we see a picture of the actual drills that don't cut please. In focus and showing the shape of the tip side on please. 'Cos they're either being run backwards or they're ground wrongly. The steel could have work hardened, but the aluminium isn't.

The drill with a carbide tip ground in a wedge is a perfectly usable thing, I've got a set of them and they are for drilling hard steels. You essentially melt your way through, so you need a fair amount of power to drive them. They're not for the faint hearted! This doesn't, however, inform the OP as to what is the problem in his particular instance.

I'm looking forward to a picture.

Rgds Simon

Thread: Dividing head for Tom Senior Mill advice
10/03/2022 20:28:23

As a Senior citizen (Light Vertical division) myself, and the owner of a BS0 head I can vouch for their compatibility.

Having said that I have done a number of jobs where I thought a dividing head which could be mounted horizontally or vertically would be a good thing. Then I bought a 6 inch (being the diameter of the rotating platen) rotary table and all was well in the world.

I also have a 10inch diameter rotary table; this is too big for this little mill as it's too easy to not be able to reach the centre of the table with the limited y axis travel.

Thread: Micrometers
07/03/2022 15:03:18

Derek - I've sent you a PM

Rgds Simon

Thread: Myford ML7 1956 ... Question on drive belt and Stalling when cutting
06/03/2022 16:27:05

What's stalling? Does the motor keep turning but the countershaft stops, or is it that the spindle pulley keeps running but loses its drive to the spindle. If it's this last there is a drive dog in the bull wheel (the gear behind the chuck) which must be engaged. Has it slipped out of the drive position - perhaps to use the back gear.

You really need a copy of the user manual.

5 thou a time for the best you can do is definitely wrong.

Thread: Electrical calculations
04/03/2022 19:18:08
Posted by Georgineer on 04/03/2022 17:18:05:

I [milliamps] = 550 [milliwatts] / 24 [volts] = 23 milliamps near enough.

The relay will not be fussy about a few volts under or over the 24, nor will it be fussy about a.c. or d.c.

Sorry but No.

I agree with the arithmetic - but I need to echo Andrew's comment about the relay WILL mind whether it's AC or DC. They're not interchangeable.

Thread: Precision ground flat stones in UK?
28/02/2022 11:26:17

I think some of the science of flat stones has got lost.

Not only do the stones have to be flat, but also blunt so they DON'T cut the bed being stoned. They only cut the projections, elsewhere there isn't enough down pressure to get the stone to cut the wider area of the bed.

So the stone floats on a film of oil except where there is a raised ding. This creates a local pressure spot enough to get the stone to cut.

The theory is that a truly flat bed won't suffer local abrasion from having the stone rubbed over it as the stone doesn't contact the surface.

The function of using a grinder to run over the flat surface of a new stones is to knock the aggression out of the abrasion. It doesn't need a diamond wheel to do this, a stone wheel will do the job just fine. A new oilstone as supplied is pretty much flat from new though to get the "floating" effect it needs a dust over to even up the thickness of the oil film against the machine bed being stoned.

I think I recall that Don Bailey of Suburban Tools covers this in detail in one (or more) of his YouTube presentations. Ditto Adam Booth (Abom79).

Rgds Simon

Thread: Crank handle method and sequence
19/02/2022 08:36:13

Colin - be my guest.

Do "show and tell" when you've got something workable.

Rgds Simon

18/02/2022 22:29:59

Coincidentally I made something very siliar a couple of weeks ago, in my case for the "x" travel on my Centec mill.

centec handle.jpg

I cheated and made it in three parts. First the centre boss - which I decided I didn't need to make as a ball - so I milled two flats on the boss and hid two M6 tapped holes in them. I then made the two arms of the handle, with balls and tapers to suit, and drilled and tapped the inboard end of these M6 to match the boss. A short grubscrew in each preserved alignment and held the arms in place while I welded the arms to the boss.

Having now established the orientation of the handle part I drilled and tapped a hole in the end of the small arm into which the handle was then loctited. A bit of fettling around the welds just to tidy it up and Robert is your Mother's brother.

It's not as pretty as the examples above - but it'll do a good turn nonetheless.

HTH Simon

Thread: Boxford AUD Chuck Quandary
16/02/2022 19:41:43

Simon -

Can I suggest that you might do well to ring Rotagrip in Birmingham who have usually got spare jaws for the standard chucks in stock. Not only that but they know what they've got and will recognise the chuck you have from a few vital dimensions, and be able to match the body to the correct jaws. This can be a bit of a minefield to the un-initiated. Not only must the tee slot be right, but the pitch of the scroll has to match as well. Usual disclaimer applies - but I've never asked for the wrong thing from them.

Standard internal jaws come hardened and ground, they usually need a little bit of gentle fettling to get them to be a nice sliding fit.

Once you have identified the chuck body and found jaws to fit, buy a couple of sets of soft jaws. These can be the secret to all sorts of otherwise difficult holding challenges, and (being soft) are easy to machine to good concentricity in situ. Jobs like turning large flat washers are suddenly a doddle with soft jaws.

HTH, best regards Simon (another one).

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