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Member postings for David Kenyon 2

Here is a list of all the postings David Kenyon 2 has made in our forums. Click on a thread name to jump to the thread.

Thread: Any uses for an old tired lathe bed
03/08/2019 19:39:29
Posted by Pete Rimmer on 03/08/2019 18:45:27:

My first scraping project was a S7 bed. The simple shape makes for a great first project.

That's an idea , I might have a go at scraping it.

03/08/2019 19:38:22
Posted by Mike Poole on 03/08/2019 16:59:03:

Did you replace it because the old bed is beyond being reground? If there is enough meat for a regrind then it may have some value to someone. Maybe a super long bed could be rigged for making cues or the like.

Mike

The problem with a re grind is the cost , I managed to pick up an excellent second hand bed much cheaper than a re grind

03/08/2019 16:49:43

I replaced the bed on my Myford S7 a while back and the old bed has been sat under my bench ever since. Before I have my next tidy up and take it to the tip is there anything it might be useful for.

Thread: Crucible for annealing cast iron piston rings
18/07/2019 20:14:40

Thanks John, would be useful but I can probably work it out for myself if I need too so don't spend too much time looking.

17/07/2019 14:31:51

Also does the crucible have to be made out of cast iron or can I use steel

17/07/2019 14:02:31

I made some piston rings for my Gypsy engine and I want to heat treat them using a crucible [Trimble method I believe].

Reading on the internet I see reference to a formula which gives the dimensions of the crucible for a given ring size, does anyone one know were I can find this formula?

Thread: Is it bad practice to lock my Myford lathe using the slow speed lever
24/06/2019 16:46:44

Seems I might have to change my ways then , I will try and get in the habit of using

the locking pin.

Drilling a hole in the back plate to aid unscrewing sounds like a good idea, thanks.

23/06/2019 21:45:06

When I remove a chuck or tighten a collet on my Myford Super 7 I lock the spindle by engaging the back gear , effectively engaging two gears to lock the spindle. I realise there is a locking pin at the back of the spindle but its just easier the way I do it.

Is this bad practice or is it normal for other Myford users.

Thread: Brown tarnish on brass plate
14/06/2019 21:37:04

Hi , I made a Congreve clock about 4 years ago , the brass has a bright polish and coated with Renaissance wax. Its kept in a glass case.

On the brass plates I keep getting a brown mark , almost like a light rust, just in a couple of small areas. I can polish it out but it always seems to come back .

Is this caused by a bit of contamination in the brass plate itself?

Thread: Cast iron dust , is it really that bad for lathe beds.
14/06/2019 20:16:35

Well finally finished my barrels , I was going to machine a spare but got fed up with the black mess.

May regret that decision later down the line .

Have spent the last two days cleaning my mill/lathe , to be fair the most of the dust was external and

the slideways were still clean but at least I feel better now and the machines are all readjusted .

img_1571.jpg

02/06/2019 20:11:55

I will give it a wipe over before I start barrel no2 then probably do a strip down when I get to no4.

I like to keep my machines clean anyway so I suppose a strip down will not do any harm.

Judging by how easy It is to machine I am guessing I have soft meehanite bar.

02/06/2019 13:57:36

I have been machining a 2'' round piece of cast iron into a finned barrel for an engine I am making.

Going between lathe and mill I have managed to produce a large amount of swarf and everything is covered in black dust, including me.

Not enjoying it and I have another three to do.

Will all this dust be a problem, do I need to strip down my equipment and wash everything off when I finish barrel no4.

Thread: Need help making a camshaft
05/04/2019 20:03:06

That's great Jason thanks , I presumed the flank had a slight radius, just curious but how do know

the flanks are flat.

05/04/2019 17:47:34

Looking at the timing it shows the crank moves 240 degrees for the inlet and 260 for exhaust so that would be

120 and 130 for the camshaft . On the dials for the jig it states 130 / 140 which confuses me .

Here is the whole plan , you will need to zoom in img_1302.jpg

05/04/2019 17:44:24

Its for a four cylinder Gypsy engine, the plans show that the cam is built up from separate parts ie. the lobes and bearings are machined then Loctite onto the shaft.

Now I understand what a camshaft does and how it operates but I have little knowledge of making one. After some research I feel making the lobes on my mill using small flat cuts with the aid of a rotary table would be the best option for me.

So I need to come up with some figures for the machining process.

The plans show just one lobe as below

img_1296.jpg

There is also a timing guide and some plans for a jig which I am not sure how its used but I assume it may be for a grinding machineimg_1297.jpg

Thread: Making split bronze bearings [ silver soldering ]
28/03/2019 18:20:45

Well I tinned each half with soft solder then clamped them together and re heated.

Worked well, I managed to machine 5 bearings with little trouble although the bar did split on my third bearing

when I drilled out the centre, the drill pulled into the bronze.

I re soldered but this time put a jubilee clip around the outside until I had finished the bore .

22/03/2019 14:05:54

Well thanks for the replies, certainly given me something to think about.

I was worried that the solder on the mating surfaces would compromise the final bearing size

but I see this is not the case.

I will get some solder paste and give that ago first , will let you know how it goes.

21/03/2019 20:52:16

I need to saw a piece of phosphor bronze round bar in half and then solder it back together before machining to size for the split bearings.

My question is, do I put flux on the mating surfaces before clamping together or leave them clean , clamp together and then just run flux along the join.

When the piece is soldered I will need to turn the diameter down so I presume the solder will need to penetrate the join so it stays in one piece.

Thread: What is a good quality lathe paint
21/03/2019 20:36:57

lathe (8).jpgI did my Myford about two years ago, as already said keep the old filler coat on . Once you sand off the paint the filler is easy to sand and you can get a nice finish .

I used HMG Paints C71 enamel **LINK**

Use a good primer , I used HMG again , still looks good today.

lathe (5).jpg

Thread: Line boring question
08/03/2019 15:10:29

Hi , my lathe has not got reverse so is there a way of sharpening a cutter to run in both

directions, I was thinking a single point with a rounded tip. This is so I can use a shorter

bar and reverse it to do each half as suggested in the Benz thread

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