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Member postings for Stub Mandrel

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

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Thread: Can Anyone Name this Engine?
20/04/2010 20:44:00
Les,
 
Thanks  - that looks like it. Shame it isn't a JAP or a Villiers, but i guess they'd have a name plate on. It has got a Zenith type13A  carb! That exploded view will come in really handy.
 
V8,
 
 the answer is not to ask at our tip. People put 'useful' things to one side, the staff appear to get first look and no-one 'notices' if they move in the wrong direction. I've also got two 4" vices, one a well used Record No.3, the other a bigger, cheaper one in nearly new condition.
 
Mad really, re-use is much better than recycle and I could cry for some of the stuff you see in skips - every poor kid in the UK could have a computer if there was a 'rescue scheme'.
 
At least ebay and the like mean some stuff stays in circulation, but not cheap low-value things 
 
Neil
Thread: Disassembling of Minimill / X2-clone / XJ-12 Ballbearings
19/04/2010 22:23:42
Marcus
 
Lying awake worrying about your mill last night (not really!) I figured out why your fine feed doesn't work!
 
You have to slide the boss of the big wheel with three handles on it across so the castellated dogs on it engage with the dogs on the worm wheel (you can see them in your photo!)
 
Yes, the system is so crude the fine feed wheel just turns the big one slowly so LOADS of backlash and you need a lot of steady pressure to turn it, but surprisingly repeatable (about a thou).
 
If you fix the wheel to the spindle, then you won't be able to use the lever wheel to raise and lower the head!
 
Neil
Thread: Can Anyone Name this Engine?
19/04/2010 22:15:49
Yesterday I took a load of rubbish to the tip. I always keep an eye open for any scrap worth rescuing, and it was a vintage trip - a 2' rule, a few hand tools and a vintage trowel for the gardener in the family
 
But I also picked up this petrol engine! Let's call it a 12" scale model, its only about 16" tall.

It's a four stroke with a flywheel magneto and a vane governor. The spark lead is cut short but the mag still works.
 
The flyweel nut had stripped the thread on the end of the crankshaft and the flywheel was (just) held on by a 6mm self tapper! Luckily the taper was still OK I've replaced this with an 8mm high tensile bolt through a 1/4" thick disc into the end of the shaft.
 
It needs a cowl over the flywheel fan, a plug and a petrol tank (plus a fair bit of TLC) but should look fun on a small trolley!
 
But does anyone know what kind of engine it is?
 
Thanks in anticipation!
 
Neil
Thread: Dilemma - neither lathe nor mill working
19/04/2010 21:57:35
> A possibility if such grub screws can't be easily found?


Starting to think like a true engineer


Neil
Thread: Disassembling of Minimill / X2-clone / XJ-12 Ballbearings
18/04/2010 21:49:59
Changing to roller bearings on the C3 type mini lathe is straightforward if you take it step by step. I wrote it up for ME a few years ago and the article has pics of my improvised pullers in it.
 
Changing them in the mill should be no harder. Arc should be able to advise on the right rollers.
 
The effect on the lathe was remarkable -I was able to duplicate feats of turning and parting that have been held up as examples of a well set up Myford in the past - parting tool at 2" diameter, cuts 1/8" or more deep. I don't know if the mill will improve so much - I think it's main problem is rigidity. You can greatly improve this by scraping the joint between the base and the pillar bracket. On mine it was very roughly flycut
 
Neil

Edited By Stub Mandrel on 18/04/2010 21:50:33

Thread: ZA12 - a new option for model engineers?
18/04/2010 21:13:02
>HORRORS!!!<
 
My apologies, every time I make a post I get a website error and a blank page - but the messages must evetually get through.
 
Kelvin - can you delete the multiple posts?
 
My apologies to all,
 
Neil
 
 
PS: Thanks V8, sorted now with your help!
18/04/2010 20:59:36
Sorry for starting a hare running, then disappearing - it turns out the reason I couldn't access the Brock Metals website was that my wife's computer had caught a cold - a nasty virus, despite multiple layers of protection!
 
Aeinstall of windows later and it's all working much faster now. The temperature issue does suggest it isn't the best thing for cylinder heads of reven steam cylinders
 
I wonder if it would do for the gear bellhousing for my backburner Fordson Tractor project?
 
Ill have some thinking, maybe 5 of us could share a #150 ingot ?
 
Thanks
 
Neil
 
P.S. can anyone remind me where in XP you set the keyboard to UK? I can't get a pound sign!
 
18/04/2010 20:50:15
Sorry for starting a hare running, then disappearing - it turns out the reason I couldn't access the Brock Metals website was that my wife's computer had caught a cold - a nasty virus, despite multiple layers of protection!
 
Aeinstall of windows later and it's all working much faster now. The temperature issue does suggest it isn't the best thing for cylinder heads of reven steam cylinders
 
I wonder if it would do for the gear bellhousing for my backburner Fordson Tractor project?
 
Ill have some thinking, maybe 5 of us could share a #150 ingot ?
 
Thanks
 
Neil
 
P.S. can anyone remind me where in XP you set the keyboard to UK? I can't get a pound sign!
 
Thread: Motor Valves, What are they good for?
18/04/2010 20:49:54
I have a few from an Astra that snapped its cambelt. It turned out one of the ones I hadn't expected to replace was slightly bent, and I couldn't get to teh shop, so I took a skim off it with an ordinary HSS tool. It lasted a couple of years until the big ends went (at about 250K!)
 
Neil
Thread: ZA12 - a new option for model engineers?
18/04/2010 19:53:42
Sorry for starting a hare running, then disappearing - it turns out the reason I couldn't access the Brock Metals website was that my wife's computer had caught a cold - a nasty virus, despite multiple layers of protection!
 
Aeinstall of windows later and it's all working much faster now. The temperature issue does suggest it isn't the best thing for cylinder heads of reven steam cylinders
 
I wonder if it would do for the gear bellhousing for my backburner Fordson Tractor project?
 
Ill have some thinking, maybe 5 of us could share a #150 ingot ?
 
Thanks
 
Neil
 
P.S. can anyone remind me where in XP you set the keyboard to UK? I can't get a pound sign!
 
Thread: Motor Valves, What are they good for?
18/04/2010 19:47:08
I have a few from an Astra that snapped its cambelt. It turned out one of the ones I hadn't expected to replace was slightly bent, and I couldn't get to teh shop, so I took a skim off it with an ordinary HSS tool. It lasted a couple of years until the big ends went (at about 250K!)
 
Neil
18/04/2010 19:47:03
I have a few from an Astra that snapped its cambelt. It turned out one of the ones I hadn't expected to replace was slightly bent, and I couldn't get to teh shop, so I took a skim off it with an ordinary HSS tool. It lasted a couple of years until the big ends went (at about 250K!)
 
Neil
Thread: ZA12 - a new option for model engineers?
18/04/2010 19:45:32
Sorry for starting a hare running, then disappearing - it turns out the reason I couldn't access the Brock Metals website was that my wife's computer had caught a cold - a nasty virus, despite multiple layers of protection!
 
Aeinstall of windows later and it's all working much faster now. The temperature issue does suggest it isn't the best thing for cylinder heads of reven steam cylinders
 
I wonder if it would do for the gear bellhousing for my backburner Fordson Tractor project?
 
Ill have some thinking, maybe 5 of us could share a #150 ingot ?
 
Thanks
 
Neil
 
P.S. can anyone remind me where in XP you set the keyboard to UK? I can't get a pound sign!
 
Thread: Motor Valves, What are they good for?
18/04/2010 19:37:52
I have a few from an Astra that snapped its cambelt. It turned out one of the ones I hadn't expected to replace was slightly bent, and I couldn't get to teh shop, so I took a skim off it with an ordinary HSS tool. It lasted a couple of years until the big ends went (at about 250K!)
 
Neil
18/04/2010 19:37:44
I have a few from an Astra that snapped its cambelt. It turned out one of the ones I hadn't expected to replace was slightly bent, and I couldn't get to teh shop, so I took a skim off it with an ordinary HSS tool. It lasted a couple of years until the big ends went (at about 250K!)
 
Neil
Thread: ZA12 - a new option for model engineers?
09/04/2010 21:21:37
I'm really inspired by the article on die casting in the latest ME (4375).
 
I'm not ready to make a 12-part die, but the alloy ZA12 sounds like a godsend - stronger than cast iron and melting at a lower temperature than aluminium with high fluidity and no degassing! (88% Zn + 11% Al + 0.8% Cu)
 
Can it be true? I can't get the Brock Metals website o load but I found this:
 
 
"ZA-12 is the most versatile zinc alloy in terms of combining high performance properties and ease of fabrication using either gravity or pressure die casting. ZA-12 is the best gravity casting alloy for sand, permanent mold and the new graphite mold casting process. It is also a good pressure die casting alloy (cold chamber) which provides a sounder structure than ZA-27, as well as higher die cast elongation and impact properties. For these reasons, die cast ZA-12 often competes with ZA-27 for strength application. An excellent bearing alloy, ZA-12 is also platable, although plating adhesion is reduced compared to the ZAMAK alloys."
 
A quick look at google suggests ZA12 is even better than phosphor bronze for bearings?
 
The big question has to be cost - I bet it costs a lot more than cast iron, but if you can make your own heavy duty castings without even needing to achieve a red heat, you wll save truckloads.
 
Does anyone out there have experience of machining or using this materialfor structural castings?
 
Neil

Thread: M E Threaded Hex Bolts
08/04/2010 21:56:13
Might not be the answer you want, but can you not use 5BA, which is 0.126" diameter?
 
I use them for 1 1/2" screws at 1/12 scale.
 
Neil

Edited By Stub Mandrel on 08/04/2010 21:58:22

Thread: Brazing Pickle
08/04/2010 21:51:50
I think easyflow flux has flourides in it as well as borates.
 
The chemistry of flourine is not nasty, its downright terrifying. When they made the first atom bombs in WWII, they used uranium hexaflouride to get the radioactive material into a gaseous form they could enrich. The big challenge was to make unlubricated airtight seals, and the UF6 attacked all and everything. I think the solution they came up with was PTFE - which is usually given as a product of the space race, not the nuclear arms race!
 
Please correct me if I'm wrong!
 
Neil
 
Thread: speed control pcb for Clarke CL300 lathe
08/04/2010 21:37:11
Thanks John,
 
Only three posts and you've already earnt the thanks of a host of mini lathe users, present and future
 
Neil
Thread: Is the 4" Rotary Table at ArcEurotrade better than SOBA ?
08/04/2010 21:32:51
Looks OK for £75.

 
I made my own from continuous cast iron. It's as ugly as a pig, but it has a wierd cotton-reel table (not slotted) that gives the advantage of swapping chucks with my mini-lathe, without too much height.
 
I made the gear wheel by free hobbing, the first one had 61 teeth! the second was dodgy too, but then I discovered that brass came in different grades and got a good wheel using 1/4" engraving brass. One of the failures became the handwheel and the 61-tooth one sits in the bits box to remind me not to get too cocky!
 
Neil
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