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Member postings for David K

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

Thread: Silver soldering zinc plated steel
21/03/2020 22:20:59

Cup Alloys , sorry to butt in on this thread but when I click the link for your

HT5 Kit all I get is a Internal Server Error.

Thread: Silver solder question
18/03/2020 13:31:36

Thanks Jason .

Cup Alloys , had an interesting read on your site and could do with some silver solder.

Would the low temp 455 be ok for this job , thanks

17/03/2020 18:02:20

Correction fluid Tippex ? do you use this to stop the flux spreading around the joint.

17/03/2020 17:16:03

I need to make some unions like the ones pictured below.

They are for 1/8 copper pipe and I would like a neat join with

minimal solder showing.

I was thinking whether to use solder paste in a syringe rather than the

rod which I am used too .

gyp8 (2).jpg

Thread: Material to make ball race thrust bearing
14/03/2020 14:23:49

Thanks for the replies ,

13/03/2020 20:38:17

I need to make a thrust bearing for my model engine.

The plans state using mild steel for the races and case hardening after machining.

My question is , can a use silver steel and then heat treat it afterwards.

Reason I ask is that I have some silver steel in stock.

Thread: D H Gipsy mk1
09/03/2020 18:55:13

Made a jig to hold the stubs ready for Silver solder

gypsy (61) (medium).jpg

Then soldered in the bottom plate ,

gypsy (62) (medium).jpg

I soak in citric acid and then polish

gypsy (63) (medium).jpg

gypsy (64) (medium).jpg

09/03/2020 18:50:59

Inlet manifold , started with a piece of solid stainlessgypsy (55).jpg

Machined the shape out on the mill

gypsy (56).jpg

Turned the inlet stubs

gypsy (58) (medium).jpg

Then finished them on the mill

gypsy (59) (medium).jpg

09/03/2020 18:25:55

Turned some valve guides

img_2662 (medium).jpg

I turned the valves a section at a time to help minimise flex in the material

img_2666 (medium).jpg

Once complete a fine skim and polish before parting off

img_2771 (medium).jpg

Valves complete with collets and caps , springs were bought items.

gypsy (53).jpg

08/03/2020 19:46:29

That's ace Jason, always someone who goes one better.

08/03/2020 19:42:50

Hi Clive ,, yes your correct , I have just checked my oil pump and they are 9T Gears.

Bought my gears from HPC Gears 

Edited By David K on 08/03/2020 19:45:24

07/03/2020 20:07:46

Hi Clive, I have not got the advantage of using CAD, I will learn one day , so I just tend to trust the drawing and get on with it. The length of the valves gave me a problem , I had to make some more about 2 tenths longer.

Already bought the oil pump gears and fitted them , seemed ok and camshaft is made and fitted.

I have not written down any errors , nothing major just a couple of figures written down with the decimal point in the wrong place ie. 0.12 instead of 0.012 .

02/03/2020 20:57:15

Removing more material to form the top shape

img_2561 (medium).jpg

Tapping the plug holes, the digital gauge has proved very useful since I purchased it.

gypsy (47).jpg

Finished Cyl head , I made five so one spare.

gypsy (48).jpg

02/03/2020 20:51:56

Cut some alloy blanks for the Cyl headsgypsy (41).jpg

Turned the combustion chambers on the lathe thengypsy (42).jpg moved to the mill to drill and cut the valve seats.

Cutting the fins was more problematic than the barrels, I found it better to use no fluid and to cut in the same direction as the saw , 'climb cutting'

gypsy (44).jpg

02/03/2020 20:30:59

Hi JA, Just looked at the date on my first pictures and it seems I have been working on this for just over a year.

Must admit I did not think it was this long but I do tend to make one part or so then take a break.

I believe the castings were made by a ' Les Chenery' , I know there are a few around but rarely come up for sale.

The castings are good , a few small 'blow holes' have appeared but nothing to cause problems. I have tapped a lot of small threads into the casting and they seem to be holding up so they must be pretty good..

Drawings are very good , a few decimal points on the dimensions have been in the wrong place and there are a couple of mistakes but so far the build is going well.

The castings were quite solid and I have removed a lot of material from them , the only place were the material has got a bit thin is the side wall next to the camshaft bearings and cam followers. If I could start again I would move the crankshaft a few thou over to one side which intern would give a bit more camshaft clearance.

02/03/2020 08:57:09

Hi , that piece of Alloy I used was in fact an older jig I had lying around from a previous build.

I had cut the four slots so it compressed slightly on my four jaw chuck in my lathe.

As for the gear , all you need to do is turn a recess slightly smaller diameter than the gear and then tap the gear in with a soft mallet. The steel gear will slightly cut into the alloy as its tapped in and this is enough to hold it tight.

Remember to bore a hole through the centre of the jig so you can drift the gear out when finished.

01/03/2020 18:41:21

Parting off some piston rings from cast iron

gypsy (30).jpg

Made a small oven to set the ring gap

gypsy (31).jpg

Heat to cherry red

gypsy (32).jpg

rings before fitting into cylinders and adjusting ring gap

gypsy (33).jpg

01/03/2020 18:36:03

Turning the pistons

gypsy (28).jpg

Milling the cut outs and reaming the gudgeon pin hole


01/03/2020 18:28:55

Conrods basic shape

gypsy (25).jpg

forming the rods on rotary table

gypsy (26).jpg

Finished rods

gypsy (27).jpg

01/03/2020 18:25:36

Boring the cylinders

gypsy (23).jpg

Finished cylinders

gypsy (24).jpg

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