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Member postings for Speedy Builder5

Here is a list of all the postings Speedy Builder5 has made in our forums. Click on a thread name to jump to the thread.

Thread: Thread pitch
03/10/2012 18:27:31

Uh - thought model engineers screwcut things like nuts !

Thread: Flux for stainless steel
23/09/2012 08:11:13

And for soft solder, phosphoric acid or Jenolite rust proofer

Thread: Pneumatic brake for CNC rotary table
21/09/2012 12:51:19

Great bit of kit, now we look forward to a compact unit so you can use the table in both horizontal and vertical axis. By the way, what was the clunk clunk clunk at the end of the video ?

Thread: Going to put companies out of business?
21/09/2012 12:39:19

Years ago, after a pint or two, a little group of us 'dreamed up' Magnetic Holographic Projection, wherby metal particles would be held in space by the process and then heat fused into the solid. That seemed impossible, but it will probably be reality one day.

REPRAP seems like a clever application, but like all applications it must suit the process as does the laser / resin forming process.

Thread: Finishing Steel
20/09/2012 12:49:30

When I served my apprenticeship in the A/c industry, we wern't allowed emery cloth on aluminium - wet and dry yes. Reason - emery particles embed themselves into the softer materials, so beware. Brass/bronze etc - don't use emery for moving parts.

Thread: Spanner
20/09/2012 12:43:15

Yes, good idea if you can find one the right size. I forgot to mention that its probably best to find some stainless steel ariel - not the brass ones.

18/09/2012 19:34:13

Following on from my enquiry about small head Hex bolts, I needed a 9Ba box spanner (Nut runner actually). Sorting through the come in handy metal stock box, I found a snapped off telescopic car ariel. One of the sections was about the right size to make a small box spanner. I took an old hex key and ground it such that it would enter the tube. I 'drifted' it into the tube to form the right size hex, then sawed the tube off to length. Cross drilled for a tommy bar and silver soldered it into place. Magic. Perhaps not the strongest, but suits my purpose. I suppose I could get the next sized section tube, slide it over the hex portion and silver solder into place etc.etc

Thread: BA Bolts
10/09/2012 15:07:42

Recently bought some 8Ba bolts - small head. Being ignorant, I bought these presuming that small head meant a smaller than specification Ba size. On closer inspection, they turn out to be 3.25mm A/F. Now I know Ba dimensions are based upon metric sizes converted back to imperial, but I do think suppliers should state "Metric headed Ba bolts".

Anyone know of a good supplier of small spanners to fit these metric headed bolts ?

Thread: Compressor
07/09/2012 21:14:28

Hands up, how many of us have a model boiler ?

Hands up, how many of us have them tested regularly - yes of course all of us.

How many of us have a compressor in the workshop - quite a few of us. Anyone had theirs tested lately ?? I ask this as my Aerograph filter / regulator 'exploded' this afternoon - well it is at least 60 years old, and it did have a central steel tube which held the filter pot on, and that had rusted through. But what I ask of the air reservoir? How often should we hydraulic test these ?

If the reservoir catastrophically failed, you could say 'au revoir' to the workshop and probably oneself.

What's your take on this subject ??

Thread: Sulphuric acid
25/08/2012 10:43:34

Over here in France - beyond the reach of EU Regs Ha Ha!, we use any old acid to clean the limescale off the lavatory pan etc, the rest goes down the drain / septic tank!! Mind you, one has to take a few precautions before sitting on the seat again.

Acid, acetone, both celulose and synthetic thinners and even the banned carbon tet sit on the same shelf at the local DIY store. I would hate to think what the HSE would say about that, however it is becomming more difficult (but not impossible) to buy sodium chloride crystals. As an aside, I saw Calcium Carbide for making wet acetyline gas on the shelf, and wondered who on earth bought that.

Thread: Elephant Hawkmoth
19/08/2012 11:42:12

here is an Empreor moth (Saturnia pavonia) we saw in our garden in SW France, about 4" over the

wing wing ti wing tipspic 022.jpg

Thread: Whistles
16/08/2012 19:33:25

Thanks for the info Michael - I think that just about wraps it up.

16/08/2012 12:22:21

If I make a whistle to LBSCs design for Speedy, and test it on compressed air, would I get the same/similar results when used with steam. I will be using a bit of brass tube from a crumpled trumpet picked up at a car-boot sale for 50p. Why? I read that ordinary brass tube does not resonate the same as "Music quality brass" !!

Thread: Speedy boiler
16/08/2012 12:13:25

Building the boiler for LBSCs 5" Speedy loco. What working and test pressures should I be using on a silver soldered copper boiler ?

Should the boiler pressure gauge be 0 - working pressure + 20psi or should it be 0 - test pressure + 20 psi ?

Thread: Suds pump
17/07/2012 19:58:50

Good call BUT, I used one with its pkastic resevoir for a couple of years before the peristaltic tube gave up as it was impregnated with small shards of metal. Replaced the tube and again it failed a year or two later. By the way, you have to do a bit of re-wiring of the float switches, but its not difficult.

You do need a realy good filter before the return pipe from the lathe / mill etc.

I now use a small indoor pond pump - but it doesn't have much of a head.

On the single phase lathe, I have a 3 phase dual voltage suds pump, running on 240v single phase. Connect live and neutral on two of the terminals, and a capacitor across the other two. Ok you loose 60% of the power, but there is heaps left for the pump.

Thread: Milling Copper
04/07/2012 12:26:27

With great care - a splinter of copper in your eye and you could end up blind. I have used a jig saw quite successfully with the sheet sitting on top of a sheet of closed cell insulation. Then cut thro the sheet and insulation together. Wear goggles as a minimum.

Thread: workshop lighting
27/06/2012 20:44:52

I have flourescents and incandecent lights plus anglepoise all switched separately. I use the incandecents when you just 'pop in' for a screwdriver - extends the life of flourescents. I have tried low energy, but to date have not found any bright enough, and they DO TAKE TIME TO WARM UP.

Thread: Reaming Brass
27/06/2012 20:39:07

I bought some strange reamers some time ago, they have 3 or 4 flutes machined on a quadrant of about about 100degrees and on the rest of the diameter (260 deg) there are NO flutes.. I was told that they may be for thin sheet. This probably doesn't hep you, but another trick was to put some rag around the reamer to 'fill' the flutes and reduce chatter. Use talow or lard as cutting lubricant.

Thread: Which New Mill Vice?
27/06/2012 16:11:01

For me, this is a precision vice, and I often have to grip 'rough' castings. I would not like to 'bash' the vice handle too hard on this one. However it look a nice bit of kit.

Thread: Chuck for Rotary Table
21/06/2012 19:26:55

Just be aware that a chuck can 'Un-screw' from the rotary table if you do some heavy milling in the wrong direction !! Try to think of some sort of locking device. I use one of my lathe chucks mounted onto a false nose piece welded to a flat plate, then clamped to the table. I crossdrilled the chuck/nose piece and place a pin into the hole to stop it unscrewing at the critical moment.

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