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Member postings for DC31k

Here is a list of all the postings DC31k has made in our forums. Click on a thread name to jump to the thread.

Thread: Help needed in finding info and eng. drawings on this 2-2-2
09/05/2020 11:09:02

I think it might assist your search if you let us know the gauge of the chassis.

Then, for instance, pages such as or similar in intent to:

could be greatly insightful.

You could try '2-2-2 model locomotive' in Google and look at images.

Otherwise, try and find a list of model locomotive designers (LBSC, Martin Errors, etc.) and if any of them did a 2-2-2 design.

Thread: Spot Facing With Slot Drill?
08/05/2020 10:04:37
Posted by Dr_GMJN on 08/05/2020 09:42:03:

I'm thinking align the drilling head, spot face, then drill the clearance hole.

As you mention 'drilling head', please be a little wary if carrying out this procedure in a drilling machine if the only depth control you have is your hand on the quill.

In this situation, the flat-bottomed cutting tool can chatter. Any slight flex of the drilling table also does not help. Sensible use of a rigid depth stop and a strut under the table can improve results dramatically. Experiment on a scrap piece of the same material to get a feel for the operation.

Thread: Making a 6.0mm x 19.0mm Keyway Broach Guide?
06/05/2020 17:06:04
Posted by Brian Wood on 06/05/2020 15:24:07:

There are standard tables for broach guide bush depths, I'm sure you can find such information on line

To slightly temper that remark, the standard tables assume a standard size of broach (body thickness, first tooth thickness, increment per tooth, number of teeth). With the multinational nature of tooling sources, this assumption may not be justified.

It is better to measure what you actually have, as the OP has done and make some common sense decisions based on that (the slot has to be deep enough to allow the broach body to pass through the uncut hole; the first cut of the first tooth should be of a similar depth to the cut between the first and second teeth; the last cut of the last tooth needs to be made with an easily-available total shim thickness). In a hobby setting, you are not seeking maximum metal removal rates and if you have to make an extra shim and push the broach through one extra time, it does not matter.

Thread: Clarkson Autolock Mystery Tool
06/05/2020 16:53:45
Posted by Geoffrey Wright on 06/05/2020 12:18:55:

...a Beaver Mill, which I have, with a drill chuck. which I assume is the standard Clarkson 30 Int taper. I usually use the Myford drill chuck, set into a Clarkson 2 MT fitting, but this then becomes quite long and limits the size of the drill I can use.

My question is, are these drill chucks available/obtainable anywhere?


It is a little difficult to answer your question as you are using terminolgy in a non-standard way.

The taper in the mill is 30 INT, also known as NMTB 30, ISO 30 and most generically as '30 taper'. It has nothing whatsoever to do with Clarkson, who were a manufacturer of tooling. Clarkson-made tooling is available in many different tapers.

Your description of using the Myford chuck sounds like you have a 30 taper (male) to 2 Morse taper (female) adaptor.

Your drill chuck itself will have a female Jacobs taper in it, known as a JT (possibly, if it is quite modern, it may have a B-series taper). So the Myford chuck you have has a 2 Morse to xx JT arbor poked in the back of it.

To mount a drill chuck into the 30 taper spindle, you need a 30 taper (male) to appropriate Jacobs taper (male) adaptor. It is not normal to swap drill chucks between arbors, so if you want to use a drill chuck in both the Myford and the mill, you need two chucks and two arbors.

As an example of the breed, have a look at:

Thread: Quick setting nuts
05/05/2020 17:38:28

As with so many other recent questions here, Google is your friend. Put in 'quick setting nut' and see what it brings.

Start here, for example:

Thread: Wet\dry vacuum hose
04/05/2020 19:53:51

Forgot to say that if you do buy a replacement, check the direction in which it is wound. The hose generally screws into the fittings each end and some hoses are wound left hand (thread) and some are wound right hand. Hence, for it to work with the existing connections, the hand has to be the same.

04/05/2020 17:49:09

If you put the words 'smooth bore vacuum hose' into Google, you may find something that will meet your needs.

Are they swarm troopers? Today is, after all, Star Wars day.

Edited By DC31k on 04/05/2020 17:54:01

Thread: What is this part
03/05/2020 14:41:53

Thread: Hydraulic Copying Attachment - Micrometer Adjustment
02/05/2020 08:28:25
Posted by Alexander Smith 1 on 01/05/2020 20:31:13:

...A manual for the whole attachment would also be useful to ensure that nothing else is missing....

The attachments come in various sizes and the hydraulic requirements of each size may differ.

You may need to identify more fully what you have. has the usual over-priced manuals available but they seem to start at the 300 series. Rondean has manuals also, and for the smaller series. Google also threw up dgrdesigns as a source, but their website appears to be unwell. There is a set of instructions for 300 series on eBay, item 352938828050.

Put 'Hepworth copier manual' into Google and look at images for more leads. It is also worth searching for 'Hepworth tracer manual' as an alternative term.

See also Andrew's thread here:

As a starter for 10, the manual for the 300-series (Chipmaster, Bantam) says the pump is 0.6 gallons per minute flow and the relief valve is factory set at 300 psi.


Edited By DC31k on 02/05/2020 08:38:46

Thread: Clamping force calculation
02/05/2020 07:56:09

Since you show a pin joint at the base of the middle arm, there will be no clamping force as you have drawn a mechanism. The horizontal arm will try to move to the left due to the wedging action at the right of it and will result in the piston tilting in the cylinder and all pressure being lost.

To make this statically determinate, you need an encastre joint at the base of the middle leg and to specify the angle at the right hand end of the horizontal arm.

Thread: Chuck key for Fish chuck ?
01/05/2020 10:31:04

There is a list of Jacobs keys and their dimensions at:

If the key is does not engage the teeth on the chuck sleeve, you can press the sleeve forward slightly to close up the gear mesh. Conversely, if you have a key where the mesh is too tight, you press the sleeve backwards a little.

Thread: Tooling for a spline
30/04/2020 13:49:40

There is a British Standard for involute splines, BS3550 (pdf copy on Scribd), but it is 1963, so a bit late. However, if you can read the introduction/preamble to it, it may reference an earlier standard from which it was derived or consolidated.

Thread: Strange WW1 Chuck - 1MT
30/04/2020 12:17:20
Posted by Clive Foster on 29/04/2020 13:38:55:

The issue with using that style of chuck on a drill sharpener accessory for a T&C grinder is body clearance from the grinding wheel.

Have you seen the Vertex drill sharpener? It uses ER collets to hold the drills, but the sharp end pokes out of what is conventionally the back of the collet.

I think they do it this way so you can repeatably set the projection of the drill (push the point against a stop and tighten the collet nut). In conventional ER use, the tool can move backwards as the collet is tightened.

A holder copying this could be made to the same taper as the ER collet, of suitable minimum wall thickness, which has potential to give a good clearance.

Only gotcha I can see is the smaller collets in any series have a good recess in the back of them (on my ER20, 7-6 is the smallest with non-recessed bore).

Thread: 4-jaw chuck jaws....
30/04/2020 09:45:00
Posted by Clive Brown 1 on 29/04/2020 20:55:46:

...a supply of small brass packing pieces is useful but a difficulty with using these is that they fall out very readily...



for how to overcome this.

Thread: Cutting a slot in a turned piece
27/04/2020 15:11:00
Posted by ega on 27/04/2020 14:09:36:

If you have to hold on the diameter you can install a close-fitting sacrificial plug to prevent close-up.

Have sacrificial chucking pieces been consigned to ancient history?

Rather than trying to hold tiny pieces, hold a big piece and do the work on it, then cut off the small piece you want as a final operation.

Thread: Myford dividing head enhancements
25/04/2020 08:43:08

Does anyone have any useful enhancements or modifications to a Myford dividing head that they could describe?

I am aware of the bar support in Arnold Throp's book.

There is the method of fixing the head to the end of the lathe spindle, described here:

(Side note: the BHI articles of the month provide interesting reading)

I was thinking of extending the 1/4" BSF tailstock centre clamping capscrew and using a support screwed to that down to the machine bed.

Other than that, I do not recall seeing much on this accessory.


Thread: Number punches
24/04/2020 19:08:23

If you do not receive better suggestions, this is for sure covered in one of GHT's books, but I cannot remember which one, the red or the green.

One thing you have to bear in mind is that a jig will only work well if the stamps are all made the same. So you might have to tune up the stamps themselves for ultimate success.

Thread: Centre finding
24/04/2020 11:41:47
Posted by Ian Johnson 1 on 24/04/2020 10:24:55:

I had similar issue with my 'cheap edge finder' it has what I thought was a 4mm diameter stem but after drilling a few misplaced holes I measured it and it was actually 3.9mm diameter

But you were doing a different thing and using a different technique, so how is it relevant to the OP's problem?

It is misleading effectively to tell someone to buy new kit, when the particular fault you describe in your own kit is not germane to his actual problem.

If you are finding the centre of a bar using the correct technique (i.e. picking up both sides and halving the reading), you do not even need to know the diameter of the edge finder.

Thread: Startrite Mercury drill
21/04/2020 21:48:21
Posted by Michael Gilligan on 21/04/2020 17:22:37:

According to RotaGrip, 13.5 tpi is German Conduit Thread

Rotagrip are incorrect. They conflate the PG number with the thread pitch.

This site is very good in case you have not seen it before:

There is an M16 x 1.75 tap listed on page 2 of the Rotagrip catalogue though.

Thread: Hardened and chromed steel rod
19/04/2020 18:53:44

Have you tried hydraulic ram suppliers and rebuilders? This material is their daily bread.

Alternatively, what about gas struts for toolboxes, hatchback car doors, etc.?

Once you get under the chrome, the rod is easy to machine. You could grind it off gently if you cannot turn it off.

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