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Member postings for Mark C

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

Thread: Boxford goes crunch! Now refuses to turn.
02/01/2016 01:25:18

Bob is correct, did you take a look at the pictures he linked?

What you have is the sub-table for the milling attachment not the boring table. As Bob said, the table replaces the cross slide as a whole (and should have it's own gib). It is much bigger than the sub-table and has the same size "T" slots as the slotted cross slide. If you had one it would not have a spigot but has a dovetail instead to match the saddle.

Mark

Thread: J&S 540 help
24/12/2015 23:59:01

David, what material were you grinding?

Mark

Thread: Casting lead
22/12/2015 20:14:15

The milk would be for extra calcium to make stronger bones with all the extra weight from the lead?

Actually, it was supposed to help line the stomach to prevent it getting into your system if I remember my training correctly - whether it was "science" or not is any ones guess......

Mark

22/12/2015 17:34:27

"Compo" that is the name I could not remember!

You must have spent ages searching to find that Michael..... I still don't know the alloying elements but A knowledgeable scrap dealer might?

Mark

22/12/2015 15:41:07

I worked at a company that made steel wire products (rolling, shaping and drawing) and we had a lead bath on the end of one furnace to quench with - it had a fair few tonnes of molten lead in and was open to the atmosphere but the temperature was reasonably low and I tended to stay well away! Living in Yorkshire, the biggest threat to my brain cell was beer....

Mark

PS. That was not it Michael

22/12/2015 12:01:30

Thanks Michael, I had not twigged pewter when I typed the post (and I have a couple of tankards made from the stuff). The name I am trying to remember is probably a tradesman "work" name but I still can't remember it!

The important part is the increase in value - anyone with tin should keep hold or get a "proper" price as it is semiprecious these days!

Mark

22/12/2015 09:27:44

You might find that your gas pipe is not ordinary lead but a special alloy containing tin. I can't remember what the trade name for it is but it is worth a lot more than ordinary roofing or water pipe lead!

Mark

Thread: Con-rod design question
18/12/2015 19:21:22

Martin comes close to mentioning the important terms, I will mention them implicitly: "Slenderness ratio" and it references the radius of gyration to the length (the l/r mentioned above). If there are any crane designers or (probably) structural engineers they would be able to recognise the question and answer it eloquently but I will decline and leave you all to search the term I suggest!

Mark

Thread: elliott 00 omnimill
25/11/2015 10:18:16

Ian, that is a damn good idea!

Mark

24/11/2015 12:16:25

I can't remember exactly what the nut looks like but if you measure it up (don't worry about the thread details/internal diameter) and send me a sketch I will draw it up properly and send you a "proper" drawing showing what is needed.

Mark

Thread: Material for pulley shaft, and bearings
24/11/2015 00:05:01

You might try searching for "trailer hub" (internet and ebay). Might be just what you want ready made?

Mark

Thread: Pipe pressure rating
23/11/2015 09:40:51

500K psi is nearly 10 times strength of steel? How is this going to work exactly?

Mark

Thread: elliott 00 omnimill
22/11/2015 19:50:48

I just measured the model and the thread is 1 & 3/8 by 16 tpi whit form (55 degree). You might need to fiddle the thread diameter a little depending on the exact form you cut......

Mark

22/11/2015 19:30:54

Mick,

I have a detailed model of the spindle etc I made when I converted to taper bearings. You are welcome to the model and the drawing if you contact me with an email address so I can send them. When I say detailed, I was bored and modeled the thread form in detail.......

Mark

Thread: Random Thoughts on Steam Injectors
17/11/2015 21:02:42

I don't know anything about steam (apart from it is hot and hotter still if you constrain it) but I can tell you that domestic plumbing is generally rated to 5 bar if you didn't know already (i know as my cold mains is often up at +8 bar and had to fit a regulator). As for the instant hot water taps, they might be different but I would imagine the tap is on the cold side?

Mark

Thread: What direction should this forum be taking?
17/11/2015 18:36:35

So, that's it then Jason. No matter that it appears the vast majority were happy the way things were, posts will now be edited until they conform to the minority who whine.

Mark

Thread: BIG blowlamp ID
16/11/2015 20:51:01

That's not a blow lamp - it 's the igniter for a Saturn rocket.......that is why it is on it's side

Mark

Edited By Mark C on 16/11/2015 20:51:45

Thread: How do I cut a Verge [Crown] Escape Wheel ?
16/11/2015 01:20:58

just uploading it now!

escapement assy.jpg

15/11/2015 21:47:19

Michael, If you let me know the dimensions of your wheel and the size of the "flags" i will try and sketch it up for you and check the geometry so you will know it will work before you cut anything.

Mark

Thread: Build threads.
14/11/2015 14:32:58

4 Pages of comments and read nearly 4000 times. I sincerely hope it is not locked just because it did not go all your own way given the number of other opinions!

Is this not a public forum? If you want control of a transcript, keep it private....

Mark

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