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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: To ER is human but ER collets could be divine
19/06/2021 18:13:50

Please look up Axminster Junior chuck.

ER20, will fit Taig spindle at 3/4-16 so should also fit Sherline.

In the past, Axminster would make you an adaptor for this chuck, so if this service is still offered, the M14 x 1.5 might be possible.

Thread: Locking Bearing preload nut
19/06/2021 18:05:33

When you say you will drill the nut, will the grub screw bear on the leadscrew?

An option is to saw the nut approximately 50% through (if really keen drill at the end of the sawcut so it does not create a stress riser) and then drill and tap parallel to the leadscrew (saw cut maybe 25% along the length of the nut. The flexing of the thinner bit due to the axial pressure of the grubscrew will stop it undoing.

The idea is shown as slide 2, letter N here: . You can either compress or expand the nut.

Where did you find an ACME screw in 10mm dia.? Is it an imperial or a metric pitch? Is there a possibility it could be trapezoidal thread?

18/06/2021 13:38:41
Posted by Roderick Jenkins on 18/06/2021 10:18:43:

...My solution would be to get a 1mm end mill with a 6mm Weldon shank and put this in a Weldon to Clarkson threaded adapter.

Is this the same thing that is known as an FC3 cutter? And a Clarkson FC3 adaptor?

To the OP: see for background this thread:

Thread: Seeking slim-nosed spring tapping guide/follower
18/06/2021 13:30:41
Posted by Bill Phinn on 18/06/2021 12:10:38:

Presumably I'd be best off reducing just the tip to a taper [like on auto centre punches], rather than trying to reduce the whole piece of 3/16

Yes. Only 'machine' the minimum amount you need to fit inside the tap wrench. The reason I suggested silver steel is that its diameter and roundness is better than cold rolled. I do not know if a standard tap guide pin is hard: if it is, you could chuck it up in a cordless drill and give it a gentle introduction to a 4 1/2" Makita.

18/06/2021 07:31:47

Make a pin with an end that is less than 3/16".

Buy 3/16" silver steel. Cut off suitable length with hacksaw. Chuck up in drill (press, pistol, cordless - Bradson-type might be a little tedious). Switch on. Use file to reduce to desired diameter. Loctite on suitable retaining collar.

There are innumerable round things that can be made without a lathe.

Thread: George Thomas retractable slide for the myford.
17/06/2021 16:45:18

See third post of this thread:

Thread: Myford 254 S
12/06/2021 16:31:54
Posted by John Parry 4 on 12/06/2021 13:53:56:

....the spindle is to BS 4442, so that is what I need to quote when ordering.

See where it states the standard is withdrawn.

You might have more luck if you quote a more modern and internationally-recognised standard.

See: (A2 spindle nose).

Thread: I Need this exact motor!
12/06/2021 09:24:43

Send a link to the item to Inverter Drive Supermarket.

Under the picture in the link is a table, headed "Typenschild:"

3 phase, 1.5kW, 2730rpm (In UK, we would note it as 2800rpm), flange mounted, B14 frame size, 19mm dia. shaft.

My German is non-existent but it does not take a whole lot of translation skill to determine the above.

Thread: Myford 254 S
12/06/2021 07:45:47
Posted by MichaelR on 11/06/2021 18:17:03:

...the non standard spindle still has the D1-3 nose taper all you need is to remove the D1-3 pins from the chuck and replace with suitable threaded studs and nuts.

Are you sure it is a non-standard spindle?

If the D1-3 taper fits, there is a possibility it is an A2-3 taper.


The A-series tapers were more popular in Europe. From those I have seen, the stud has a reasonably precise plain diameter that goes through the holes in the spindle before being threaded at a smaller diameter, then a washer and a nut.

Thread: Belt for a Duplex D27
11/06/2021 20:48:00

It might be worth giving Jena-Tec a call as they are the manufacturers and the D27 is listed as a current model:

There are number of online belt size calculators where you enter the pulley sizes and centre distance and it will tell you the length. The width should be easy to determine.

If it has multiple pulley combinations, work out the length needed for all of them as then you lessen the chance of an error.

Among many others, George Lodge ( has a good selection of flat belts.

Thread: ER32 Extension
10/06/2021 16:59:25
Posted by Vic on 10/06/2021 13:53:19:

Locating some bits on the Eccentric website isn’t easy.

I do not follow your logic. Clearly, you have been able to locate it in order to determine that it is out of stock.

I am not sure what you want it for, but Mr ega's point is worth some contemplation: a _spindle mounted_ version of the device will locate and register on, the aptly-named spindle register. This is a parallel portion of the spindle, concentric with its axis of rotation. This is how concentricity is assured in threaded items: the thread itself plays no part in locating the device.

There is no such parallel portion on an ER32 collet chuck when the nut is removed. At best, you might have a flat face that is perpendicular to the axis of rotation*. So consider how the extension you want might achieve concentricity if the only thing joining the two parts together is the M40 thread.

* Yes, HSK connections use a face contact, but also use a taper.

10/06/2021 08:31:56
Posted by Vic on 09/06/2021 23:17:45:

No, I don’t want an ER chuck for a Myford lathe, I want an ER32 extension as stated in the thread title!

If that is what you want, why are you confusing us all by posting a picture of one that is clearly spindle-mounted?

It takes seconds to post a link to the correct item:

For those who have never seen one before, this _replaces_ the closing nut on an ER32 chuck and uses a female M40 x 1.5mm thread.

As this is not an item that is used commercially, or in any other application than the Turnado system, there is a worldwide monopoly supplier of this, Eccentric Engineering. So if it is out of stock, you have to make your own or wait.

Thread: Which was the better design of Airship: R100 or the R101?
10/06/2021 08:07:00

It's not relating to the ones under discussion above, but there is a good selection of material on airships here:

Thread: Availability of a T33 & T34 Myford Change Gears?
05/06/2021 20:38:15
Posted by old mart on 05/06/2021 20:08:39:

...a large number of Myford gears of all sizes always on sale.

Unfortunately, he is not looking for a "large number" "of all sizes". He is looking for one gear in each of two specific sizes, 33t and 34t.

Could you point us to a specific eBay seller who currently, or within the last three months, has or had one or both of these in stock. Thanks.

If the OP does not want to cut his own gear, another option might be a 3D printed one. Have a look on Thingiverse as one might exist already, or there will be a program there to produce the file to enable it to be printed.

A second option is to approach an eBay seller, you_engraving. He makes Colchester and Harrison gears in delrin at good prices, and might make you a Myford one.

Thread: Harrison M250
04/06/2021 17:03:16

Assuming it does not take any torque in use, just repair what you have. The difficult bits for which you think you need CNC are already there.

Drill and thread the hex part for at a size one or two less than the main stud (e.g if it is M8, tap it M6 or M5) and make up a shouldered threaded stud to go into that thread. Secure with loctite.

With care and a little thought, you do not even need a lathe - could be done in a drill press.

Thread: Taper due to tailstock height misalignment.
04/06/2021 06:29:47
Posted by duncan webster on 04/06/2021 00:16:17:

The bar will be bent upwards...

The OP says, "turning parallel between centres ".

You link to equations for a cantilever beam, which implies encastre at one end. How does a pointy centre do this?

Thread: Screwcutting on the Bantam
28/05/2021 19:42:58
Posted by Andrew Johnston on 28/05/2021 19:02:01:
Close, but it's mathematically impossible for it to be exact.

How close do you want it to be for it to be acceptable to you?

85 DP is 0.03796" pitch. 27tpi is 0.03703" pitch.

The difference is insignificant and is absolutely overwhelmed by the tolerances to which the machine is built.

We are here for good, practical engineering solutions and the above fits that category. In the context of what the OP is asking, it is a little misconstrued to cast a shadow over it on a minor technicality.

Thread: Incorrect thread pitch
28/05/2021 09:17:02
Posted by Howard Lewis on 28/05/2021 09:00:40:

So, in a simple train, your 28T Driver would need to drive a 84T gear on the Leadscrew, with any suitable gear as an Idler.

Could you please explain how you associate the concept of "simple train" with a Colchester Triumph lathe, that has two gearboxes (let us call them 'range' and 'thread pitch' between spindle and leadscrew.

To strengthen the credibility of your observations, you need to find a setting on the gearboxes that gives a 1:1 ratio (direct drive) ratio between gearbox input and leadscrew output.

Thread: Screwcutting on the Bantam
28/05/2021 09:07:34

If you want to go the compound route, you can model the 7/9 as 1/3 * 7/3.

For the 7/3, you use the 49/21 that you have. This then gives the following possibilities using one gear that you already have, the other gear (the numerator of the fraction) being a make-or-buy: 40/120, 20/60, 23/69, 22/66, 19/57.

The big caveat with the compounding is whether the gears will fit in the space available.

RDG, G&M and Bede have Bantam gears.

This would solve your problem:

Thread: Help , can someone provide me with some equations !
28/05/2021 08:12:37

You might have to expand on the context of your question. Forgive me if I am wrong, but it initially smells like you are asking us to do your homework for you.

One thing is for sure, the load on the worm gear will vary a lot. When the table is horizontal, it will see very little load. When the table is at 40 degrees and you are trying to move it back to horizontal, it will see a considerable load.

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