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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: BSW
10/04/2021 17:06:33
Posted by Howard Lewis on 10/04/2021 16:13:53:

Your thread gauges probably don't include a 2.3 mm pitch, the closest is likely to be 2.25 mm...

Could you kindly point me to any standard metric thread anywhere in the world that has a 2.25mm pitch.

If you are unable to fulfil the above, perhaps you could ponder on why any set of thread pitch gauges might include that pitch.

Thread: (bicycle) thread identification?
10/04/2021 08:03:14
Posted by jon hill 3 on 09/04/2021 23:02:41:

Again a book or website recommendation on threads going into pitch, tpi, history etc would be very helpful.

There is no one resource that will do that for you.

A few steps on your path to screwing utopia:

https://journeymans-workshop.uk/allthread.php

https://www.gewinde-normen.de/en/index.html

https://www.haguefasteners.co.uk/BoltingGuides/HagueFastenersGuideToScrewThreadSizes.pdf

https://www.npl.co.uk/science-technology/dimensional/npl-notes-on-screw-gauges

Thread: Help needed with identifying a tool
09/04/2021 15:16:40
Posted by Jeff Dayman on 09/04/2021 14:29:11:

Just in case you still want one though, the tool is called an adjustable pin spanner, seen at link below. Very good for use on nuts with drilled holes in the nut face...

Would you kindly postulate a mechanism whereby the round pins on the spanner to which you refer will fit without slippage in the square or rectangular cut outs in the nut the OP shows in his photograph. Thanks.

Thread: Chronos Wheel Engine
09/04/2021 10:53:42

Not plans, but a start...

http://www.jamesriser.com/Machinery/ChronusWheelEngine0001.pdf

http://www.jamesriser.com/Machinery/ChronusWheelEnginePage10001.pdf

Also http://www.jamesriser.com/Machinery/ChronosPinionMill.pdf

The spelling mistake somewhat impedes the search.

From: https://mb.nawcc.org/threads/chronos-wheel-cutting-machine-help.37443/

Thread: ER40 collet nut seized
09/04/2021 10:35:32

Isn't it galling when that happens?

Thread: BA screws and nuts
08/04/2021 19:00:43
Posted by Dougie Swan on 08/04/2021 17:57:34:

I used to buy my ba stuff from Mike Sandyford of "items" mail order

Is this the same source as the items ad in the magazine, I ask because it seems very hard, at least to me, to find anything on the website

I think the website to which you are referring is

https://itemsmailorderascrews.com/

Contact details and address are given at the bottom of the page. You can compare those with the magazine advert and see if they match. The blurb also says that the company was established in 1994 so that might provide a pointer if your purchases pre-dated that. The website states more than once that you should email for a price list and that transactions should be done over the phone. It is not an online shop.

Thread: Source of 2 inch balls for water pump
08/04/2021 14:37:58

http://www.dejaydistribution.co.uk/balls5.html

Thread: Involute tooth depth
07/04/2021 15:26:28
Posted by Howard Lewis on 07/04/2021 15:17:20:

If you use an Involute gear cutter, it is likely to be marked with the df number, which is the depth of cut.

More usually referred to as d + f .

If you search for 'd + f gear' or 'whole depth of gear tooth', there is a lot of material available.

For metric gears, this one is good: https://khkgears.net/new/gear_knowledge/abcs_of_gears-b/basic_gear_terminology_calculation.html

For imperial gears (not your current challenge), this one is good: https://www.bostongear.com/-/media/Files/Literature/Brand/boston-gear/catalogs/p-1930-bg-sections/p-1930-bg_engineering-info-spur-gears.ashx

Thread: Tailstock Die Holder (metric)
04/04/2021 18:36:00

Do you have a next-size-up-to-one-inch holder? That is perhaps infrequently used? If so, could you make a much thicker-walled shim and install it semi-permanently with Loctite? Would also need longer screws.

Thread: Beaver VBRP Mk 1 manual / info help
03/04/2021 11:49:00

To the best of my knowledge, the manual you have is all that is available. There is no specific manual for the Mark I model. That said, a Mark II Beaver manual is more help to you than a Mark I Bridgeport manual.

There is a thread here:

https://www.model-engineer.co.uk/forums/postings.asp?th=123926k

where you might find information on your model.

If you type 'beaver site:model-engineer.co.uk' into Google, you will find other threads here on this subject.

Similarly, if you type 'beaver site:mig-welding.co.uk' into Google, you will find all the threads on that forum on the subject.

Thread: 11/16 UNEF Drill size
02/04/2021 17:49:39

If you type your topic title into Google, exactly as you have written it, you will find the answer to your query.

E.g. https://www.gewinde-normen.de/en/unified-extra-fine-thread.html

It will also suggest you use a drill sized at 16.6 of those new-fangled continental millimetric units rather than the bizarre not-in-any-standard-range imperial number quoted above.

Thread: ER32 collets
31/03/2021 20:43:48
Posted by old mart on 31/03/2021 16:20:30:

When thinking about clamping a 3mm cutter in an er32 collet, it is unlikely that the shank of the cutter would be as long as the collet.

Rego Fix show up to four different possibilities for the internal arrangement of ER collets. See

https://us.rego-fix.com/system/files/docs/2017-09/RFAG_TD_ER_Spannzangen-Masse_EN_0.pdf

Thread: ER 16 / 20 or JT2S, JT33 and JT6 Straight shank tooling
30/03/2021 17:13:15

Look harder:

https://www.mscdirect.co.uk/ERI-48340C/SEARCH:KEYWORD/product.html

Thread: Colchester Bantam Mk1
29/03/2021 15:34:56
Posted by James Woodman on 29/03/2021 13:35:46:

I was hoping to find a user manual online, but no luck.

No luck or lack of proper effort?

Fourth post:

https://www.model-engineer.co.uk/forums/postings.asp?th=133708

Thread: Myford dividing kit
29/03/2021 08:09:01

If you use 'Myford headstock dividing' as your search term, you will find plenty of inspirational material.

https://www.model-engineer.co.uk/forums/postings.asp?th=135799 (note mention of George Thomas)

https://www.myford.co.uk/index.html (picture of 'new headstock dividing attachment' but clickable link did not work for me)

http://www.hemingwaykits.com/acatalog/Compact_Indexing___Dividing_Attachment.html (another mention of GHT).

http://bhi.co.uk/wp-content/uploads/2017/04/HJ-April-2017-Article-of-the-Month.pdf

Edited By DC31k on 29/03/2021 08:11:38

Thread: Is RSJ Steel machinable?
24/03/2021 19:14:45
Posted by SillyOldDuffer on 24/03/2021 17:31:18:

High-specification RSJs are sometimes made of exotic steels...

Could you give an example please of a 'high specification RSJ' and while you are at it, please give an example of a low or normal specification one just so we understand the distinction you are trying to make.

Structural steel will be either S275 or S355, properties for which, including machinability, will be easily found with the aid of a nearby Google.

Thread: A home-made gear - will it work?
24/03/2021 07:00:16

To call it a gear is rather to inflate its status and thus to imbue it with characteristics and complexity far in excess of those required for its functionality.

It is a counter with teeth. So long as it has 24 teeth and so long as only one tooth at a time can engage in any groove of the leadscrew thread, it will work.

About the only importatn thing is Mr Hopper's advice concerning the clocking of the new teeth: they need to match the graduations on the threading dial or you will have to realign the fixed mark.

Hacksaw off the teeth of the existing gear so the splines remain. Glue on a doughnut of plywood (PU glue has good gap-filling abilities if you cannot hacksaw in a circle). Coping saw to get the perimeter roughly circular and roughly the right diameter. Glue in 24 wooden dowels poking out of the perimeter. Report back to us in 5+ years when it wears out, complaining that its life was too short.

You are completely on the right road when you say it has no power transmission requirements at all. There is a direct correlation between its power transmission and the amount of thinking necessary to replace it.

Thread: Cellular Plastic Shed Base - Advice Please
21/03/2021 18:51:33

A shed base is a completely different animal to a shed floor (or a floor for a shed).

Maybe the OP would clarify if the proposed shed comes with (wooden?) floor or not as some the answers above make assumptions one way or the other and the advice given will not be valid if the wrong assumption has been made.

Thread: Coventry Quick Change Tool System
17/03/2021 17:32:20
Posted by ega on 17/03/2021 14:06:48:

mgnbuk:

Thank you for pointing to the Cutwel product; when I searched against the thread title I got no hits.

It may be because it is being erroneously described as 'quick change'. Coventry know their product as 'Easy Change'.

Catalogue here:

http://www.coveng.co.uk/wp-content/uploads/2020/01/Easychange-Catalogue-New-Brand-2019.pdf

Thread: Colchester Chipmaster disassemble
16/03/2021 19:11:10

That's it. The way your photo is rotated, you need to attack it at about 7:30 (am or pm does not matter).

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