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Member postings for Clive Brown 1

Here is a list of all the postings Clive Brown 1 has made in our forums. Click on a thread name to jump to the thread.

Thread: Multimeter recommendations
07/09/2021 15:59:26

Ebay has a wide selection at <£10 that will tick your boxes. I bought one years ago. It's done all I want of it with no problems. A useful extra is to buy a pair of croc. clips that push onto the probes, often not included with these cheap meters.

My main criticism is that the leads are on the stiff and springy side. I believe that silicone rubber makes for greater flexibility if you can find a meter so fitted.

Thread: Win 10 back t0 Win 7
07/09/2021 14:48:12

+1 for Windows 10. I have gone through most iterations of Windows and W10 is the best so far IMO. It's stable, versatile and user friendly. I regularly download images and video either direct from my camera and 'phone via USB or via the card reader built into the PC.

In either case Windows sees the device as external storage and files will transfer either way with no issues at all.

Linux, I've given it a whirl. It's limited and for geeks!nosmiley

Thread: Bench grinder - wheel grit
06/09/2021 15:56:18

For HSS grinding in my home workshop, toolbits say 3/16" to 3/8" and drills, I mostly use a 60 grit wheel. 80 grit would also be OK I'd think. The finish can always be improved with a slip-stone if necessary.

IIRC, my coarse wheel is 30 or 40 grit. It's used a lot less than the finer wheel, but useful for initial shaping.

No need to dry the steel after cooling.

Edited By Clive Brown 1 on 06/09/2021 15:58:55

Thread: Urgent - opinions of lathe I am going to view/buy
02/09/2021 17:58:06

Hi Andy,

Boxford did make a 16" between centres model, but I don't think that was specifically for schools. The paint is not original IMO. The short bed and CUD spec. both detract from the desirability. Also it doesn't look as if it's had "one careful owner". One very common problem with old Boxfords is broken back-gear teeth, otherwise they are robust machines. If I were at all interested I'd put in an offer considerably below the asking price.

It's not impossible to find spare gearboxes etc, but they come up very infrequently and can be pricey. I wouldn't see that as a practical option.

If you bought it, what about transport? Two fit people could detach the lathe from the cabinet and load it into a car boot but the cabinet itself is heavy and awkward. You'd really need a van or trailer.

Try to download Boxford's manual. This will give more details of the bits and pieces that should be with the machine.

Thread: 5 Rotary Table/Tailstock/Chuck Kit Info/Questions
01/09/2021 20:14:52

The chuck is self-centering.

Thread: Sheet metal saw.
31/08/2021 17:18:01

I start the cut using a standard hacksaw frame, then use the sheet saw when the plate is sideways supported by this initial cut.

Thread: A SIMPLE POINT !
27/08/2021 20:40:55

And in 50 years , (on and off), of model engineering, I can't really recall one instance of it making much difference.

Thread: Choosing a boring head
27/08/2021 11:05:14

If the OP wants to save £100+ on a boring head then Harold Hall has a design and build article on his website.

link

The instructions for making it are very clear and the cost of materials is negligible.

Here's mine. It's intended to be held in an ER collet The boring tool is made from silver steel.Boring Head

Thread: boxford lathe upgrade?
22/08/2021 20:36:56

I upgraded my 5" ME10 from "B" to "A" spec. by fitting a gearbox from an older 4.5" lathe. No problems, the main job was shortening the leadscrew to connect to the gearbox output shaft. As it will pass through the spindle, machining was straightforward.

I assume that the "C" lathes have the necessary drive keyway in the leadscrew even though the longitudinal feed uses the half nuts.

Thread: Silver solder flux has dried out.
15/08/2021 13:33:30

Since the datasheet that you link to says the flux is a water mixture, I'd say that adding a bit more won't do any harm

Thread: Allchin help
13/08/2021 15:59:43

On my drawings, the dimensional details of the brackets are to the right on the image above, ie just off-screen. They are the same as posted by Jason except the angle is given as 31.5deg.

These drawings were purchased from Reeves in the '70s.

Thread: Best material for smokebox construction
13/08/2021 09:03:54

The two 5"G. loco smokeboxes that I've constructed have been 1/8" brass, which seems a common material.for that purpose.

Thread: DIY Compression spring
12/08/2021 20:40:02

I wouldn't bother with any heat treatment. The Quorn makes minimal demand on that srpring in terms of cycling etc. As long as it very approximately meets the Prof's spec. of about 10lbs. force without coil binding then it will be OK.

Mine's probably a bit light and does not overcome the static friction of the bar until it's rocked, but that's never been a problem. Might even be helpful if too much cut is inadvertently put on, so don't make it too strong.

Thread: Centaur Inlet Valve Dimensions
08/08/2021 21:45:49

Thanks Michael, that's given me some reassurance.

I was aware of the connecting rod error from an article in ME Nov. '75 describing a Centaur build which mentions it, but then goes on to say that this is the only drawing error apart from the cam timing. Hence I'm surprised that this seemingly serious valve error wasn't identified, making me think that I might be missing something.

08/08/2021 15:45:50

Work on my Centaur has met a snag. I've machined the cylinder head and associated valve gear and started trial assembly. The exhaust side of things seems OK, but not so the inlet valve.

The initial problem that I noticed was that the inlet valve housing is too long to allow the spring cotter to assemble to the valve stem, see attached image. Moving the cotter groove 3/64" along the stem would solve this but the whole assembly is still too long to fit properly under the valve rocker. It seems that the valve and housing both need to be shortened by at least 1/8" to allow proper valve & rocker geometry. If this is a drawing error then I'm surprised in such a well established ETW design. I'm fairly confident that my cylinder head and other componens are to drawing dimensions.

Can any other Centaur bulder advise please?

centaur inlet valve.jpg

Thread: Allchin 1 1/2 scale Traction Engine Shaft Manufacture
31/07/2021 19:50:40

W Hughes, ME vol139, wrote that some builders silver soldered the splines into milled grooves, though he didn't seem to really approve, possibly non-original.

His preferred method was making a "horizontal" milling cutter from case-hardened mild steel to cut the splines on the shaft and also a matching broach, also case-hardened, with photos to prove that it worked. I'm surprised he didn't use silver steel

IIRC, I used a combination of end-milling and planing in my long-suffering old Grayson lathe, with dividing via a change-wheel.

Whisper it not, my splines only fit in in one position, but otherwise OK and WJH himself admits to the same, so I'm in good company.

Thread: 'Puter upgrade recommendations
28/07/2021 12:45:09

Your overall system spec. doesn't look too bad IMO, athough the CPU is fairly modest by current standards.

Before spending money, a tune-up might be helpful. An easy, though fairly time consuming approach could be to download Win10 for a clean install, then reinstall your software.

I assume that you currently have 64 bit Win10. If it happens to be 32 bit then that would explain your slow running, but it can be replaced FOC.

Don't try to defrag your SSD, it's not necessary and shortens its life

Thread: Stuart Twin Victoria (Princess Royal) Mill Engine
27/07/2021 08:45:11
Posted by Dr_GMJN on 27/07/2021 00:21:41:

ETA I could remove the top clamp for the final fine cuts to eliminate any distortion I guess?

Edited By Dr_GMJN on 27/07/2021 00:31:44

I think that's the last thing I'd want to do. Distortion of the CI casting will be insignificant and there's a chance of the set-up moving slightly.

Clive

Thread: Boxford BUD Tool Post
27/07/2021 08:38:48

Although not much direct help to you, your figure of 15mm topslide to centre height seems low. On my ME10 it's 1", ( 25mm).

I'd miss my top-slide, but if you do go for removing it, I'd turn up a "Gibraltar" type post that fits in the cross slide hole.

Thread: What on Earth would this be used for?
26/07/2021 18:40:24

As said, standard equipment before bottled propane became widely available. Present generation of model engineers dont know they're born!

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