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Member postings for fizzy

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

Thread: TIG welded copper boilers
14/09/2021 11:56:42

As an ex coded welder and boiler maker I have made a few with tig. The main advantage is that there is no phlanging required. Its a lot easier to set up and a lot cheaper to build. There are no downsides other than they look different. On the other hand the welder is very expensive - think minimum 500 amp water cooled industrial - nothing that you can buy at machine mart! You also know that every joint has the penetration you have put into it.

Thread: Fowler Z7S Steel Boiler
12/09/2021 20:30:27

The steel boiler will be a lot stronger than a copper one, the problem is that whilst the cu boiler will not lose its strength over time the steel one will corrode and evenyually fail, or rather be deemed as a test fail. Tensile strength of generic carbon steel is between 1.5 and 2 x that of copper, so 5mm of steel far exceeds the strength of 6mm copper. Although my business now only produces small copper boilers there was a time when we made 7 inch gauge steel boilers. These were a doddle to make. Depending on your boiler tester an alternative test is to complete the boiler welding and present it to a certified NDT professional - if they issue you with a cert (ultrasonic test cert) you are safe knowing that every inch of every weld has been tested.

Thread: Cutting a 1/2" bsp thread on Harrison L5 help
11/09/2021 14:20:05


11/09/2021 13:57:41


11/09/2021 13:49:49

thanks all - i managed to see that it says 40-100-70, pretty sure the spindle gear is 20 so do i now need 20 - idler - 70?

09/09/2021 20:43:53

there apear to be two tables. table for general screw cutting 14tpi says top-40 mid-100 bot 70 Lever-A. Another plate says for whitworth and bsf same but mid is 60. Surely tpi is the same regardless of thread profile?

09/09/2021 19:53:52

using that c hart with the 3 speed gearbox i can get close to 14 tpi by using the closest metric equivalent but can it be made exactly - never done this before

09/09/2021 19:46:55

thanks Ady - that is indeed the thing i needed - having a bad day!

09/09/2021 19:46:03

forgive me, i thought it was all the info needed. I need to know what changewheel no of teeth and positiion to cut 14 tpi on the L5.

09/09/2021 16:43:42

Help needed with gear choice and configuration in otder to cut a 1/2" bsp thread on my harrison - not threadcutting gearbox - L5. Charts are on the machine but have worn away. Thanks

Thread: Steam boiler
19/08/2021 18:46:02

With a bore of 1" and a stroke of 2" you will need a lot of steam. A customer bought two of our 5" diameter boilers to run a ham radio generating set running twin Victoria engines which worked well. **LINK**

Thread: Taps and Dies
13/07/2021 20:17:49

A very basic rule I adopt when selecting dies which applies to tap and die sets is that if the die is split it is likely to be better quality than onw which isnt. No proff other than buying them for over forty years I have found this to be the case.

13/07/2021 20:14:56

You need the same pitch as your bolts - modt likely coarse

Thread: Machining Cylinder Head Chamber Roof - DIY or Shop Tool
06/07/2021 20:59:00

William, if your not intending to go for bigger valves then you are over thinking this. The modded chamber in the above photo has beed achieved using a high speed die grinder, ive done dozens of them and thats what they all look like. If all you are modding is the chambre you wont see much gain - the inlet throat is a nightmare design and requires extensive work. Get yourself the DV bible and all will be revealed. I can only assume you are turbocharging it as thats the only reason to open just the chamber and have such a low cr. Please do tell us what its for (sorry if you already have and ive missed it). Nostalgic stuff this is !

Thread: Model Engineer's Auction
01/07/2021 21:10:06


Thread: Machining Cylinder Head Chamber Roof - DIY or Shop Tool
30/06/2021 21:31:31

Thirty years ago I made good money modding 12G295 and 240 heads.Im assuming your increasing valve size? Cutter is easy to make if youve got a lathe - 120rpm. If your wanting high compression (13 to1 is as high as you go for normal fuel) then the chamber surfaces need to be ground smooth otherwise you will get detonation. Pillar drill - not a chance. An easier way to increase the seat size is with a conical grinder. If its just to lower the compression then die grinder - still got my Bosch die grinder somewhere - and wear goggles, forgot how many times I went to a and e with cast iton in my eye!

Thread: Steam operated drain cocks
14/06/2021 18:00:17

Duncan - I opted for no.1 as it has a much lower surface area when closed so whould require less pressure to hold it shut, but either way should work.....I think

13/06/2021 12:57:59

1. drain in

2. drain out

3. valve head

4. O ring

5. Gland nut

6. ferrule

7. Out of shot - live steam line

Simples - perhaps all that time spent trying to get them to work wasnt a complete waste! Whats not shown is that you will also need a steam relief valve to release pressure to operate the valve.

Thread: Cutting an exact diameter using a carbide tip.
12/06/2021 21:25:13

Agreeing with Andrew, we use nothing but carbide tips - you need the correct tip for the job but anyone who telly you they have to be deep fast cuts clearly doesnt know what they are talking about! No problem taking cuts of 0.0002"

Andrew - have you spotted your deliberate error? LOL

Thread: Bargain?
23/05/2021 20:16:20

I got a mixed box containing several hundred for under a tenner so im good for a while. What are these people on?

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