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Member postings for Oompa Lumpa

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

Thread: Refractory brick equivalents, but smaller and free.
21/03/2015 07:47:56
Posted by V8Eng on 21/07/2014 10:37:23:

Beware, some old gas fires might have Asbestos in them!

Edited By V8Eng on 21/07/2014 10:38:12

Sharp edges too.

Thread: What did you do today (2015)
20/03/2015 21:34:22
Posted by Bazyle on 20/03/2015 09:34:46:
Posted by Oompa Lumpa on 20/03/2015 07:30:43:
Posted by Speedy Builder5 on 20/03/2015 07:04:55:

Use a hole punch - Its quicker!

Possibly, but that would require no skill.

graham.

Archery required skill, guns were introduced because any village idiot could use one.devil

I have something in at the moment that needs test firing and guess what? I am right out of Village Idiots. 451 Nitro Express come on over have a go if you want?

cool

(I'm not puling the trigger and that's for certain.)

20/03/2015 07:30:43
Posted by Speedy Builder5 on 20/03/2015 07:04:55:

Use a hole punch - Its quicker!

Possibly, but that would require no skill.

graham.

19/03/2015 08:05:52
Posted by pgk pgk on 19/03/2015 06:05:59:

. Otherwise the closest easy find is Mount Gay which is from a different carribean island.

Mount Gay........ Now that's a blast from the past. The Frangipani Yacht Club in Bequia springs to mind. And other incidents.

graham.

Thread: One wot I broke earlier
18/03/2015 09:21:20

Well, this was Mondays disaster (lesson to be learned here).

Quite often I have to make a tool or device in order to dissemble some of the bits I work on. The job on Monday requires I remove a Brass Plug from a steel tube - and they are tight! So, let's make a tool I thought. Set a piece of 6mm plate in the Mill and bored a hole in one end of it a really good fit to the circumference of the brass plug. Then, exactly across the centre drilled two 3.5 mm holes. These were to take two silver steel pins to go into the two holes already bored into the brass plug. Set the whole thing in the vice, slip the collar over the plug, insert the two pins and I could swing on it. Worked an absolute charm.

The piece of plate, two and a bit inches across and about twelve long really didn't look like a "specialist tool" so as I was in the Fab shop anyway (they have oxy acetylene, much better for heating stuff up. Well you don't think I did it cold do you?) and as I had to pass the guillotine on the way out I thought "I know, I will shape it like a spanner"

So I cropped the two corners off and tapered one of the long sides. Now we have all done this, okay? The piece was getting a bit narrow and the clamp before the blade had nothing to grab so I took a piece of 4mm plate, placed it along the long side and balanced it so the clamp, when it came down, would put pressure in the centre of this bit, one end would be on the table and the other end on the work. Press the go pedal, the blade came down, the clamp descended, there was a bit of grease on the thing, zzzzT! and it slipped right under the blade - cutting it perfectly through the centre of the hole. I couldn't have measured it better.

The only upside is there are plenty of Mig sets and a bit of hot glue put it back together. Just isn't the same thoughsad

cockup-02.jpg

graham.

Thread: Interview Harold J. Turpin june 1943
17/03/2015 21:46:20
Posted by ronan walsh on 05/03/2015 00:19:39:

P.s, isn't discussion of naughty things like firearms banned on here like it is everywhere else by the politically correct nazi's ?

No Ronan, Guns aren't naughty, people are. On a personal note I think I show great restraint considering what I actually do in my workshop. And for those interested, I am taking delivery on Thursday of the barrels I have been looking for for a double rifle build. Now that is going to be interesting.

graham.

Thread: One wot I broke earlier
17/03/2015 21:03:53

I was reading a thread on here last week and somebody remarked that it was "refreshing to see somebody admit a mistake". Well in all honesty, I never make a mistake. It is generally agreed that when I cock it up it is usually no longer fit for purpose. Some of these "mistakes" have been of Titanic proportions embarrassed

I usually average one a week in one form or another and as one of these errors was only yesterday i'm am a bit apprehensive about the rest of the week!

Anyhow, first up is last week's disaster. I decided to make myself a Saddle Stop for the lathe. A quick scoot about on the net brought up several designs and I decided to go with one that would hold a clock gauge. Naturally, the second to last operation - drilling and tapping for a screw to clamp the gauge anded up with the drill snapping (first time in a long time, these things are very patient) so, undeterred I decided I would make the slot anyway, because the drill had snapped off quite deep, hadn't it? So that exercise destroyed one of my favourite slitting saws. So I thought, I know what, I will drill the other side and tap that then turn it upside down, drill a bigger hole underneath the snapped drill and hammer it out. I snapped the pin punch. So with about thirty quids worth of tooling in this piece of scrap ally, I called it a day and drilled and tapped 6mm and put a cap screw in there. Works fine!

cockup-01.jpg

More to follow

graham.

 

Edit: Spilling

Edited By Oompa Lumpa on 17/03/2015 21:06:02

Thread: Thread Rolling
16/03/2015 11:24:33
Posted by John Stevenson on 16/03/2015 10:59:10:

You could use progressive heads for stainless but I'd imagine that Ti will work harden that fast it will have to be a one pass operation.

In a nutshell. I remember the first time I tried to knurl some Titanium, learned a valuable lesson there. Cut knurls like the Quick work but other than that, not a chance. Not unless you were using some very serious pressure. I would imagine threads would be just as challenging.

graham.

Thread: Belt and Disc Sander
15/03/2015 16:04:30

I too have a cheapish (£100 or so) 4" Belt/Disc sander. While Jack is probably quite correct in saying his present setup is far superior, what do you want from it?

If you just want to grind, shape and form "metal" and you don't want to spend a week building something eminently "far superior" - AND complicated spend Seventy nine pounds at Chester, if you want the very best - in my opinion - buy this one from Robert Sorby (beautifully made).

There are plenty of plans on 't Net to build really nice belt sanders with lots and lots of features but irrespective of whatever machine you choose, the choice of belt will make a massive difference and again, the new ceramic belts are terrific. There are a couple of people, especially the knife makers, who will make you belts of any size and grit including the ceramics that really do remove metal and above all, last.

I am quite happy using my cheap and cheerful machine, if a better quality one comes along at the right price, I will buy it but for now the machine I have is quite adequate. I

graham.

Thread: How to use a die?
14/03/2015 21:09:27

"Best bet is to get a HSS split die, I would never buy carbon steel taps & dies unless it was for a once only use, I have known the teeth to fall of on the first use on St.steel."

"Sorry these circular dies which are not split are rubbish,(cheap foreign imports) their only possible use is for cleaning up a burred or damaged thread, dustbins the best place for them."

I am sorry gentlemen, I mean nothing personal, but what a load of cobblers. I have just paid a few pence more than £32 for two Carbon Steel dies, do you think I was robbed?

Of course I wasn't. I am sorry, but a blanket statement such as "all Carbon Taps and Dies are worthless" is just so wrong. On so many levels. I regularly thread Titanium and tap Stainless steel and I will ONLY use Carbon Steel. For a couple of reasons. I need to cut more than a couple of threads each time and I need the products I make to actually work. My failure rate threading Titanium with HSS is too high and although it wears the Carbon Dies quite quickly, I don't get any failures.

If any of you have tapped Stainless you will know how bloody minded it can be. High quality carbon steel taps are the way forward. They might cost (in the sizes I use) me £27 a set but they cut through like butter.

Next up - solid dies. Do you think industry has all the time in the world to mess on adjusting dies for each and every thread they cut? Of course they don't. Solid dies are commonplace as the CNC machines need them.

The massive advantage though is I get to buy up all these "useless" tools at a cheaper rate than usual at the engineering shows - because the majority pass them by as "useless". I have just bought a good handful of these "useless" dies that came out of a major aircraft manufacturing plant, bit of a result that was.

For the record, I buy my Carbon Steel threading kit from Tap and Die. They supply Boeing, Airbus, General Electric etc. with these "useless" bits of kit. If you are buying "cheap" taps and dies, half rice half curry powder, you will most certainly get what you pay for.

graham.

edit: spilling

Edited By Oompa Lumpa on 14/03/2015 21:11:01

14/03/2015 10:05:56

Woa! Who said the man is using die nuts? I have a good few dies that are not split dies..

Back to the problem. As has been said, stainless can be challenging, as it is a small diameter wire why not stick it in th drill press or lathe chuck and then use the tail stock or the table of the drill press to hold the die stock square. Using a bit of ingenuity you can then BY HAND turn the wire into the die. You will find you need a good bit of pressure to get the thread started but once started you will be good to go.

As was said - bit of a taper is better than just rounding the wire.

graham.

Thread: MEX 2015??
13/03/2015 21:13:28

Well as long as THE model engineer show is on at Harrogate (which it is) I am all set!

graham

13/03/2015 20:56:56

Which one? There are lots.

graham.

Thread: Did you choose a career or did it choose you?
13/03/2015 20:55:44

" I now feel like an absolute fraud, because I am not a model engineer! "

And why should that be? There are no real requirements for membership here. As long as you are mechanically sympathetic you will fit right in.

graham.

Thread: Vintage Rifle
13/03/2015 10:59:13
Posted by Vic on 12/03/2015 23:37:45:

Actually, my mistake. It was the Whiscombe I was thinking of which is a recoiless spring gun.

Yes, like this one:

whiscombe-01.jpg

whiscombe-02.jpg

But I think you mean actually assembled don't you?

I often get them delivered like this, especially the more complex as people are over ambitious and inevitably break something which they then lose!

A very complicated mechanism which is rack and pinion opposing piston, a cross between the Giss system and the Rack.

graham.

Thread: Did you choose a career or did it choose you?
13/03/2015 09:36:12

I started pipe fitting for my father when I was ten years old. Every spare moment of my youth was spent working. I could drive when I was eleven and learned to turn on a Ward Capstan lathe when I was thirteen.

I built the main octagonal roof in the YMCA in Mannheim along with two other friends back in the late seventies. It is all open beam construction with no nails used at all. I did lots of other stuff like this but this one isn't too far away you could go see it if you want.

By and large, I haven't had a "working life". Just one massive hobby.

graham.

Edit:
I thought about my statement above and It sounds as if I have just had a whale of a time all my life. Far from it. Been nearly killed a few times and bear the scars. Some of the times were hard, really hard. But I have no regrets.

Edited By Oompa Lumpa on 13/03/2015 09:54:45

Thread: Choice of Steel Grade?
12/03/2015 18:01:44
Posted by Les Jones 1 on 12/03/2015 15:33:56:

The Hillman Imp dounuts I used on my Lotus Elan worked OK and were a lot cheaper than buying them from a Lotus dealer.

Les.

Well Les, I can tell you - we all (those of us trying to race these things) used to order up the Lotus ones as they were supposed to be "better". How perverse.

They still let go though.

graham.

Thread: Vintage Rifle
12/03/2015 16:10:11

Well actually since posting the pics of the Giffard I have been doing a little Colour Case Hardening myself. After a couple of abortive attempts I now have a system that produces very pretty results.
Before:

and After:

Overall I was very pleased, this is a very nice four ten.

Thread: Choice of Steel Grade?
11/03/2015 20:14:24
Posted by Mark C on 11/03/2015 17:57:02:

I reckon Imps where a special test set by the womenfolk to see which of us were suitable husband material - if you could run one as a daily motor you could probably keep a household working!

I had two, a Singer Chamois and then a Sunbeam Stiletto (wish I still had the Stiletto).

Mark

I used to Forest Rally them. Wrote five off one year. Back in the good old days when you could buy a bodyshell AND have it delivered for thirty quid. Took me a little more than a weekend to re-shell one towards the end and that included all the bodywork mods including putting the radiator up front. Desperately cold things in winter though - the heater never worked. I must have been mentally unbalanced at the time now I look back. Probably still am.

graham.

Thread: Lubrication - new lathe & milling machine
11/03/2015 19:57:00
Posted by Michael Gilligan on 11/03/2015 16:48:35:
Posted by Oompa Lumpa on 11/03/2015 16:41:38:

... I prefer to use Lithium grease. There was an online Bike shop selling this at a terrific price but I cannot remember where this was.

.

ChainReaction

MichaelG.

Thank you for that Michael, it was your good self who pointed this out to me in the first instance.

Bought a couple of tubs and time to buy a couple more.

graham.

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