No it is not in previous issues, I'll ask Martin E if he can post it here and also include in a later paper issue as I'm sure an assembly drawing would make things a lot clearer for a beginner.

And while I'm on would it be possible for future drawings to not have the tapping size hole printed in such small type and preferably positioned outside the actual part as they are hard to read at the moment.

J

Edited By JasonB on 15/03/2018 10:18:24

I have sent Martin a link to this thread so hopefully he will see your query too.

Quite a few people use a conical seat even done it myself, the angle gives a sharper knife edge and the ball seats more easily as I understand it. Though as you say a 7/32" slot drill is a quick way to do it and avoid making the tool. Reamed or bored would be ideal.

What would be more of an issue is the smaller hole being drilled may not be perfectly round so knife edge or not you may not get such a good seal.

Edited By JasonB on 15/03/2018 12:13:11

It is the smaller 2.5mm l hole that needs to be round though at such a small size it's not such an issue, different on a bigger valve like the ones with 1/2" balls in the pic above where I bored the hole

How many issues is this boiler build planned to take?

Would it not be better to have it in consecutive issues rather than alternate ones?

Just kind of think the amount of content will be read and done within a couple of days and then a month before the next part can be built, that's going to drag big time.

I think the little oscillating engine took well over a year to describe in EIM, on that basis I doubt that we will see the final boiler drawings until about summer of 2019. IF I recall correctly this all started out as the EIM steam plant with a picture of the boiler and oscillating engine, somehow it has now changed to ME and the engine featured in photos has changed to a Stuart 10V. What happened? Why the change of magazine?

Yes I just used a low strength thread lock which will come apart again with hand tools.

Hi all,

I recall old LBSC talked about his two hour hand pump,it now takes me two hours just to look for the materials! , It'll be interesting to see just how long it'll take to describe the construction of this one, not to mention the array of machine tools required to do the job.

Regards,

Bob

Umm Martin Gearing???

I have a question about the D bit to be used to make the valve seat. I am slightly confused in part 4 by the drawing of the bit figure 2 that appears to me to show the 15 degree slope the opposite way compared to the way I thought it should be and compared to the picture no 4. Anyone else have the same issue?

Revised Fig2 showing the correct tool angle will be in the next installment.

J

Yes, sounds like he has got his left and right mixed up. Would also be better if the drawing had the dimensions taken from the datum face too.

Generally drill 8mm deep and then tap, go don't reall gain anything by having more than 1.5D of fixing in a tapped hole so the 8mm drill depth should allow a thread of about 6mm or 7mm if you grind the point off the plug tap.

Regarding the missing Fig 1 This does not seem to show the cylinder as it is in Fig 3 as the section has it parallel on the outside but Fig 3 (part 4) has the end reduced to 10mm to fit the 10mm hole. and I'm not sure why the 10mm dia part is as long as it is shown on the drawing. Also seem to have ? in place of the diameter symbol in a couple of places

Edited By JasonB on 11/04/2018 12:24:03