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Member postings for Nick Welburn

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

Thread: Facing tappet adjustment screws
31/07/2022 15:50:50

Interesting, mines a type 4 2.0l but I suspect the issue is the same

31/07/2022 15:41:47
Posted by Dave Halford on 31/07/2022 15:39:18:

Nick,

Is the rocket arm wobbly then? It should be impossible to slide off the valve stem unless either the rocker or rocker shaft has a lot of wear.

It’s lightly spring loaded to hold position on the rocker arm. Because the tip is chewed up it’s pushing the rocker across as you preload it. Hence the desire to clean it up.

31/07/2022 09:21:45
Posted by Dave Halford on 31/07/2022 09:14:16:

Hydraulic lifters (cam followers) are self adjusting, unless they have collapsed and are therefore noisy in which case you buy new lifters.

Hi Dave,

They generally are, and VW described them as such. The reality is though they need a tickle here and there. I had one that had unwound so I’ve started a reset.

From what I’ve found they seem to have had a hard life and I can’t get the preload on as they slide off the valve tip from the wear (hammer!) patterns

30/07/2022 20:52:32
Posted by Robert Butler on 30/07/2022 20:25:22:

8 x £5 = £40, why bother?

Robert Butler

Well mostly because 8 x £5 = £40. I’ll have a play suspect I’ll end up ordering a set

30/07/2022 20:14:20

The heads of the tappet screws on my VW baywindow with hydraulic lifters are some what hammered and won’t easily adjust.
I could replace at £5 each… or a could give them a spin in the lathe… any downside ?

Thread: My Minnie
03/07/2022 15:37:01

Right then. I’ve got a new casting for the cylinder. Starting to think about how to tackle it.

I think I need to machine two reference surfaces one on the top and one perpendicular to that.
These will act as reference surfaces to allow me to set up to bore the cylinder and the mounting surface.

Thoughts?

Thread: parting off copper pipe in the lathe
09/06/2022 22:50:28

I've found copper hard to part off, its really soft and kinda gummy so a dig in seems to end badly. When I did the shell for my Cringle boiler I resorted to making a delrin mandrel for it and going through.

Thread: My Minnie
02/06/2022 20:16:56

Awesome thanks Jason. I do wonder how I’d have managed to make anything without your sage advice. I’ll get some ceramic board to insulate the water pump. I’m also going to hide a manual one on the side of the tender as well. I want this thing to be useable

i was a bit nervous about getting this built, it’s starting to seem achievable. It’s just like a Stuart but with more bits and actually a chunk of the dimensions are non critical.

02/06/2022 16:48:30

Good progress today, started to get the water pump together, I think this is probably more complex than anything I've tried on a Stuart engine with multiple surfaces to machine and multiple interlinked passages internally.

I've got the bones of it sorted. Needed to order a few extra 40tpi taps and dies, and a reamer set. They should arrive from Tracy next week.

I hear from what I read that the water pump on Minnie tends not to be effective. I don't quite understand this as to why, are there any obvious mod's I should make? All I can imagine is that its prone to air locking? Does need additional bleed ports in the caps? say a 10BA set screw or similar?

The gland nut has a bizarre dimension on it that I don't understand. Its a 0.384", thats not obviously metric or imperial? why the random size?

Could well be linked to the next question... where is a good source of 'O' rings? I'll need them for the piston and the pump.

30/05/2022 20:33:13

Ordered a new one, instead of trying to sort out someone else's mistakes I can start on my own.

Went for one from GSS model supplies as it was a solid £25 cheaper than the AJ reeves one. Wonder if its just markup or if there is a difference in casting quality? Time will tell!

29/05/2022 14:34:11

Right I've had play. Have I trashed the part, maybe....

So my challenge was broadly the radius under the cylinder casting was not the same radius as the boiler. In addition, the faces on the cylinder were not perpendicular to each other.

I chose a register plane, and pulled that straight. I've then machined the faces of cylinder to parallel / perpendicular.

I've also used a boring head to re-cut the curved face. This sits nicely. on the boiler now, it it isn't parallel to the top surface.

I could put a fresh cut over it, but how thin is too thin in the casting over the boiler? its sitting at around 4mm, so I could correct it, then I'd be at perhaps 2.5mm? is that too thin for a viable gun metal casting? I've then got to sort out the fact that the machined bore is likely no longer in register to the new outer faces..

Should I just spring for a fresh casting?

25/05/2022 08:25:49

Hi Jason,

The cylinder was part machined when the project was abandoned by the previous owner.I have no idea how but the finish isn’t great.
My lathe doesn’t have a slotted cross slide. It’s an Amadeal 7*14 cj18b not a big machine. Thankfully the material machines easily, I think it’s a gun metal casting.

I’ll have a look at a between centres approach but I can’t immediately see how it could work.

24/05/2022 21:32:12

Got started tonight. Had a look at the cylinder casting, lots of surfaces out of parallel. So I’ve set a new reference surface up and started to pull it together.

Now the bottom of the casting has been machined, but it rocks on the boiler so it’s clearly not concentric.

it’ll need a recut to put it right. I’m thinking could use my boring head to do an interrupted cut down that’s parallel ti the new reference surface.

Any thoughts?

Thread: Tapping straight
24/03/2022 08:48:13

I’m progressing slowly with my machining. Generally now I get the holes where they are meant to be and straight… dimensions are good.
but I struggle with getting a tap in straight. Leading to wonky studs and such like.
I use a little tapping fluid. But there must be a knack or a trick to getting a tap to thread in straight.
I have a tap handle. I have taps.
what should i do or watch?

Thread: Milling - first cuts
16/03/2022 20:48:07
Posted by John Haine on 16/03/2022 20:28:42:

I was merely responding to the above comment about climb milling which is ambiguous - the outcome could have been a decent finish or a broken cutter/ruined workpiece. I've no qualms about climb milling on the CNC which has ballscrews and minimal backlash but very cautious on the manual mill.

Apologies, poor English on my part. I was cautioning against climb milling. I was completely unaware of the concept until I’d destroyed a couple of cutters and parts.

16/03/2022 14:26:28

Something that was lost on me as a newbie was the direction of the milling is key, have a read about climb milling, its makes a heck of a difference to the outcome for me.

Thread: Embossed Rollers - Bee Keeping
14/03/2022 14:25:05

Surely there is a simple answer? is it a pineapple twist roller?https://www.bing.com/videos/search?q=pineapple+twist+blacksmithing&qpvt=pineapple+twist+blacksmithing&FORM=VDRE

Edited By Nick Welburn on 14/03/2022 14:25:51

Thread: My Minnie
11/03/2022 21:11:56

I’ve done my application for the club. So perhaps something like this with the handle popped out the floor of the tender **LINK**

More concerned about the not sharing the manifold. That sounds like a bigger change to the boiler. Guess we see what has to to be said

Thread: Cleaning corrosion from polished cast iron parts
11/03/2022 15:38:51

I’ve got a few finished castings that have been mirror finished and now show traces of corrosion. The light stuff is coming off with autosol and a jay cloth.

What’s best for the heavier stuff? Steel wool?

Thread: Tomato seed recommendation?
11/03/2022 15:20:01

Surely someone has a table of Seeds and Feeds for common applications. I believe Prince Charles used to experience chatter with his tomatoes but has since resolved the issue.

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