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Member postings for Mick B1

Here is a list of all the postings Mick B1 has made in our forums. Click on a thread name to jump to the thread.

Thread: Intended function of gib screws
18/01/2019 15:39:10

Posted by SillyOldDuffer on 18/01/2019 10:21:10:

...

...This tool is my worst buy ever, a complete waste of money. Since buying it I have been a broken man.

Cross-vices must be good for something. What am I missing?

Dave

Hmmm. I detect a faint trace of hyperbole... laugh

I nearly bought one when I was about 17, but someone told me then that they weren't very good. I didn't at first think they knew what they were talking about, but I kept on asking everybody if anybody knew anybody else who'd ever used any one of these successfully to do anything, and nobody replied.

I think I must've lost interest, or found another way to do whatever it was in my tiny mind at the time - 'twas a long time back.

Proper slide locking screws may be interspersed in the row between gib adjustment screws, but are longer and don't carry a locknut. Gib adj. screws might be grubscrews, but locking screws usually have a cap or head. I'd think it's probably a Trades Descriptions offence to describe an adjuster as a lockscrew, for the very good reason the OP gives about messing up a carefully-worked adjustment.

The slides in the crossvice in the photo still look rather short for milling, and I can't see that the moving vice-jaw has much parallel guidance - so I can't really visualise how vice-like its grip really is.

Thread: Hobby lathe
17/01/2019 16:06:08
Posted by Mick B1 on 17/01/2019 16:05:51:

I'm with SOD and think Warco will do well enough. I can work to fine enough tolerances, turning and milling in the vertical slide, with mine - if I do my part.

Machines these days are mostly good enough that the user's capabilities count for more than name-dropped brands.

17/01/2019 16:05:51

I'm with SOD and think Warco will do well enough. I can work to fine enough tolerances, turning and milling in the vertical slide, with mine - if I do my part.

Machines these days are mostly good enough that the user's capabilities count for more than name-dropped makers.

Thread: Use of Colour on Drawings
16/01/2019 11:13:49
Posted by JasonB on 16/01/2019 10:43:35:

Thank's Mick

I did not show a thickness as it is not a critical dimension, really just skim the bottom so it does not wobble. The 0.062 for the round corner fixings could just as well have been a spot face, the 0.125 is the only one that really matters as things could clash with the base if less.

Regarding the 8No 5BA holes to the left I went for the assumption that most people would take them to be a mirror image of the right hand side. The only dimension on the left extends down to the 3.0mm CSK hole and positions that and the one lower down.

...

Ah - context is important. I should've thought of that.

I'd assumed that it was for issue to a foundry and machine shop, intended to cover both casting and machining. Of course, if it's for issue with a set of castings in an ME kit, it'd be obvious it was intended only to cover machining. Nevertheless, I'd expect the corner hole spacing to be dimensioned - Anthony Mount did so on the base of the Hypocycloidal I built last year, though only from one edge and without the 'typ. <n> posns.' I think I'd probably have put in.

But I'm carping - it's always a helluva lot easier to comment on the work of others than to do it yerself! blush

16/01/2019 10:19:31
Posted by Mick B1 on 16/01/2019 09:50:36:
Posted by JasonB on 16/01/2019 09:43:51:

Mick, could you let me know what dims you think are missing please.

...

And I'd have to make assumptions about the x-position of the left-hand holes on the left-side rectangular pads, whereas that of the left-hand holes is specified.

Edited By Mick B1 on 16/01/2019 09:53:23

Edited By Mick B1 on 16/01/2019 09:55:07

Aaargh! Sorry - think I meant the right hand holes on the left-side pads!

16/01/2019 09:50:36
Posted by JasonB on 16/01/2019 09:43:51:

Mick, could you let me know what dims you think are missing please.

Well, I'm not seeing overall thickness of the casting anywhere. I've looked several times - have I missed it somewhere?

Come to that, the corner pads and hole positions, don't seem to be dimensioned either, nor overall length/width.

And I'd have to make assumptions about the x-position of the left-hand holes on the left-side rectangular pads, whereas that of the left-hand holes is specified.

Edited By Mick B1 on 16/01/2019 09:53:23

Edited By Mick B1 on 16/01/2019 09:55:07

16/01/2019 09:39:52
Posted by Martin Johnson 1 on 15/01/2019 16:20:43:

I think option 2 is a reasonable compromise.

Another personal grouse is showing edges, centrelines and dimension lines as all the same weight. BS 308 (when I learnt it 45 years ago required the edges to be a heavier weight.

...

You wanted opinions..................

Martin

I've a marginal preference for 1 over 2, on the basis that the drawing should carry all required manufacturing information in preference to any cosmetic enhancement, and there appear to me to be missing dimensions.

I was a tool designer in the late 70s/early 80s and recognise your grouse. I can remember one very experienced designer who used to draw his tools using the same thickness for all lines, entirely in 3H pencil, and might throw big, complex bundles of dimension lines long distances across a sheet of A0 draughting film. The toolmakers all hated him, and would accidentally-on-purpose manufacture his designs exactly as drawn, with hostile disregard for any errors.

Thread: Yet more confusion!
13/01/2019 11:52:56
Posted by Mick Charity on 12/01/2019 16:50:11:

We have never enjoyed a stable climate.

We have never enjoyed a stable political system.

We have never enjoyed a stable economic system.

What have we ever enjoyed that could be classed as stable?

It's because engineers keep finding ways of doing stuff better and easier. The resulting technical changes are then copied worldwide, and everything changes.

It's our fault, so stop moanin'. laugh

Thread: Siezed Drill Chuck in a Tailstock
10/01/2019 17:11:34

Never come across this, but what about a kettle of boiling water poured over the quill?

Thread: Split die cutting undersize
09/01/2019 16:51:32
Posted by Tim Stevens on 09/01/2019 15:34:23:

You need to check that your centre screw has a decent point to match the notch in the die. I find that the screws in recent, or cheap, or older die holders can be soft, or worn, or quite wrong for the job.

Cheers, Tim

That's true - I replaced the centre screws supplied in my dieholders with capscrews turned to a 30 deg included cone point.

09/01/2019 14:27:28
Posted by Baldric on 09/01/2019 14:13:38:
Posted by Derek Lane 2 on 09/01/2019 13:48:38:

Have you loosened the outer screws and just tighten up the centre this will open the die slightly then screw in the two outer to just contact the die as before. You may need to do this a few times until you get the right fit

This is exactly what I did, the outer ones just nipped after the middle one done up.

Hmmm... I sometimes find I need to feel and see the opening of the split before bringing in the outer screws to contact. The adjustment can be quite sensitive - a few degrees of turn in any of the screws can make more difference than you expect - and getting an 'ideal' fit can be elusive.

Thread: Best value parting tool for mild steel?
08/01/2019 17:29:28

Well, I use RDG's cheap holder with a 5/16 x 1/16" blade over a 1/8" packing insert in my WM250V. Works for me. I break the blade occasionally if I'm careless, so I keep a spare.

Edited By Mick B1 on 08/01/2019 17:30:19

Thread: Making small Wheels
07/01/2019 09:18:24
Posted by JasonB on 07/01/2019 07:02:12:

Make a small broach and drive that through an undersize hole

When I've thunk that thought in the past, I've doubted that it would work because of the asymmetric side-forces on the broach messing up the concentricity.

From the pics of your swarf, it looks as if it works pretty well. Thanks, I'll file that for future ref! smiley

Thread: Ukraine model engine factories
06/01/2019 10:22:47

Thanks for that - it's very interesting that a workshop of such casual appearance can produce such results.

How does the business work? Is it some kind of co-operative? Is there a sales deprtment? If each craftsman knows his part of the work in such detail, worker flexibility must be difficult or impossible to achieve - sickness or absence of each or any worker would presumably affect a range of their products. Are they self-employed (or local equivalent) or on a company payroll?

I'm just wondering whether there's any sort of an organisational model there that could work here?

Edited By Mick B1 on 06/01/2019 10:24:04

Thread: Completed Twin Inline IC Engine
04/01/2019 21:44:10
Posted by John Olsen on 04/01/2019 20:39:50:

Most four stroke model aircraft engines simply rely on the oil in the fuel to lubricate all of the engine. It might seem a bit sketchy, but remember the fuel has much more oil in it than would be typical for say a modern two stroke motorcycle. A three to 1 or four to 1 mix is pretty usual. So there is plenty of oil around and much of it manages to make its way into the crankcase. Even where big ends are plain bearings they last well.

.....

The Honda 50 stepthru also used the dipper system for big end lubrication. Larger versions of that motor like the 90 had a pump.

John

Thanks for that - all clear now. I didn't know about the high oil content in the mix, I could see there's not really room for wet sump and splash, and I guessed aero-engine revs would (typically) be rather higher than a lawnmower... face 1

04/01/2019 17:13:21

I'm obviously talking way above my level here blush- I never twigged the petroil lube or 180 crankshaft, which presumably are referenced in the drawings or backing literature, or maybe just expected background knowledge. I'm sure I've seen ball and roller mains and bigends in 2- and 4-stroke m/c engines that weren't force-lubricated, so I'd imagine your theory will *probably* work. But of course, in the 2-stroke case, unburnt petroil passes through the crankcase and over the components inside, whereas what's getting there in your engine - if I've understood correctly - is burnt combustion blowby. Will there be any effective oil left in that?

Thread: Stuart Beam Engine
04/01/2019 15:12:48

Running a caliper across the top of mine, it looks as if my column top is 2.111" across, with 55-56 thou recesses to achieve the 2.00" arm gap. I'd think it's the 2.00" across the recess bottoms - with equal depth recesses - that you need to attend to, or several other dimensions'll be thrown out. But the thin flanges above and below the recesses only fit fresh air, so the height of those is not very significant.

Thread: Completed Twin Inline IC Engine
04/01/2019 09:22:04

Outstanding piece of work.

I'm familiar with 4-stroke parallel twins from motorbikes a long time ago, and this has a similar configuration, but what about ongoing lubrication? The parallel twins I remember had oil pumps, internal oilways to crank- and camshafts, dry sump systems and separate tanks.

Thread: Surface finish
03/01/2019 09:37:36
Posted by Adrian Harrison on 02/01/2019 21:50:01:

...

...but I'm thinking my lathe being an older 3 speed pulley just is not fast enough

With a decent HSS tool, there's practically no such thing as not being fast enough. Sometimes finishing and screwcutting is done at speeds of 10 M per minute or less, or even by hand-rotating the spindle or chuck for some tasks.

Thread: Angle checker
29/12/2018 14:55:22
Posted by Pete White on 29/12/2018 10:24:03:

...

Do people have a load of broken digital calipers lying around, that hinder finding the one that does work?

Edited By Pete White on 29/12/2018 10:28:30

Edited By Pete White on 29/12/2018 10:31:29

"Have nothing in your house that you do not know to be useful, or believe to be beautiful" (William Morris)

So no, not me.

I'll keep one whose fine precision is suspect (currently an old Aldi one) for rough work and to avoid exposing a good one to very dirty conditions, but as soon as it becomes untrustworthy for that, out it goes.

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