On 19 July 2026 at 20:13 paulmichael1084@gmail.com Said:
Good questions

………..

As for the type of model, I was thinking of starting with something small (IE shoe boxed size),……………..

I don’t have a target price in mind but I’m thinking sub £500.

I just so happene dto have  ashow box and thought I would illustrate my point about…[Read more]

StoryGears

On 21 July 2026 at 10:21 Julie Ann Said:
As I read it this is a commercial venture. So the key for anyone offering to help is; what is in it for them? Will they be paid and if so at what rate?

Julie

This is an interesting point and one I touched on earlier when discussing what money is to be made.

I think that in the past a lot of the designs…[Read more]

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MichaelG.

On 21 July 2026 at 07:08 JasonB Said:
Out of interest Julie, did you get those printed loose or on a sprue?

As far as I am aware they were printed loose. I didn’t specify a sprue and there is no evidence the parts have been cut from a sprue.

I don’t know if the parts were printed horizontal or vertical, although horizontal would involve far…[Read more]

Julie

Alas I have only seen one or two examples of this design. Probably the all enclosed design did not appeal to the traditionalists.

At that time some small timing belts…[Read more]

Examples might be what Nick Rowland produces like the type B, although a loyal cycle (similar to 2-stroke) something like that with teh addition of poppet or piston valves could easily become an air/steam…[Read more]

On 21 July 2026 at 06:29 DC31k Said:
[…]Maybe the OP could comment on the slot width that is used on OEM collets of similar diameter. […]

Mmmm … He has already provided a useful photo

MichaelG.

… but I still cannot help with identification

MichaelG.

I also think that each cylinder should have a separate oil pump check valve as you describe for you 9F.

I agree a steam chest pressure gauge is very interesting to observe.

Regards

Brian B

On 21 July 2026 at 06:29 DC31k Said:

On some collets I have, at 1/16″ size, the main slit stops short of the bore and a much thinner slit continues.

When commercially manufactured collets are made they are not fully split until after heat treatment and grinding, they are then finally slit through with an elastic wheel hence the different width a…[Read more]

Lets take this oscillating engine that I based on an old engine…[Read more]

On 20 July 2026 at 21:54 Macolm Said:
Cut the sleeve to length, then split it lengthwise from one end with a junior hacksaw

With a small diameter sleeve, would we need to consider slit width, and hence the tool used to produce the slit?

The ID of the sleeve here is 2.1mm. Its perimeter is about 6.8mm.

What is the kerf width of a junior hacksaw…[Read more]

The display output is not a square wave. The Hsync and Vsync are ~5V pulses while the video and Intensity are 5v dropping towards 0v in a very scramble way. Post the oscilloscope views and let me have a look at them.

I’ll compare to my 151B.

I pressed the CE button many times after the device had started up (about one minute after power up anyways) and it did not do anything to the lights. The screen is blank of course.

When I  press the P button on the front of the panel about a minute after startup all the
red lights dim slightly. Repeatedly pressing the P button makes the P…[Read more]

It would seem then that you rule out castings. If parts of whatever you publish can be 3D printed or CNC cut (laser or water-jet) you may well have more choice of suppliers; and at least one advertises in the magazine.

Designing in metric, fine. If a builder has only imperial machines, micrometers, etc, he or she can convert the numbers…[Read more]

I will try to add a photo in the usual way of chat-sites (simple file transfers) but ever since the site owners destroyed our own albums, doing so seems a black art. The “Galley” appears no more than a totally random mixture of users’ engineering photos and odd ones the server adds for the…[Read more]

On 20 July 2026 at 20:07 Pete Said:
Ksw having to do that for his own father’s tool collection might be far more uncomfortable.

Actually, Pete, I’m currently in the same position with my own late father’s acquisitions, so I for one do understand. I’ve spent hundreds of hours producing photographic inventories of them so far.

It’s not an uncomf…[Read more]

All red LEDs on the front is normal during startup.…[Read more]

When you consider the manufacture’s minimum order value and…[Read more]

I did a sanity check by downloading the STEP file to CraftCloud again; result was £55 for one off plus shipping.

Frank: Thank you for the generous offer, PM sent.

The shank as printed is a shade under 1.5mm, which is not a standard metric size although taps and dies are available at a price.

The force…[Read more]

thank you. I’ll try this out 👍

Regards Nick.

An idler gear is one that is on it’s own and just fits between two others, it is the relationship of those two other gears that determines the gear ratio.

because I will be cutting from the side I will use an angle block against the other side of the cut

thank you👍

Thank you for the reply. No the 30T is supposed to mesh with the other gears in the arrangement to drive to lead screw. The idler is to the left marked as H on the gearing plate

if I put in a larger gear like the 40T the gearing ratio won’t be the same and won’t thread 16tpi

Very new member here and apologies for the novel I’m about to post here.

I have a Cormak TU2807v. Which I believe is identical to the Optiturn TU2897v lathe. It has a 40T spindle hear and has a 3mm lead screw.
I’m trying to set up the change gears to cut 16 TPI. According to the gear chart on the lathe, the arrangement should b…[Read more]

It will need quite a small diameter saw to go all the way through to the 2.1mm bore yet avoid cutting into the far side of the cross holes and your arbor.

What is the diameter – can we assume 10mm?

How long is it? How far from the front do the slots need to extend? An alternative formulation of this question is how much unslotted length is there to grip?

To me, gripping the threaded end in an ER hexagon collet block seems plausible.