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Member postings for S.D.L.

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

Thread: Knurling Wheel Comparison / Supplier ?
07/02/2019 08:36:27
Posted by Steve Crow on 06/02/2019 18:44:25:
Posted by Gas_mantle. on 06/02/2019 18:29:28:

My cheapo Chinesium knurling tool gives good results for the money - only £15 with 2 sets of wheels.

dsc_0002.jpg

It looks the same as mine - I'll have to check. Price was the same anyway.

I might have just got a bad one. I've noticed this with cheap imports before. I think that quality control is so low that although most things are at least serviceable, a high percentage of shoddy goods slip through the net.

The quality control is with the customer, Thats why its cheaper.

Steve

Thread: DIY Epoxy Frame based CNC MILL
17/11/2018 22:17:07

This looks an interesting post, keep them coming as you can.

Steve

Thread: ME Shows in UK for private exhibitors
13/10/2018 15:08:10

stevePosted by Neil Wyatt on 12/10/2018 22:15:58:

Posted by S.D.L. on 12/10/2018 21:44:57:

Where is the news about no Bristol next year?

Steve

I've had a press release, there will be an official announcement in the next MEW.

They hope to run a new format show in 2020.

Neil

Thanks for the info, when Dave said, “ most people will know” I was mystified as there was nothing I could find on their website. Shame as one of the better shows.

Steve

12/10/2018 21:44:57

Posted by steamdave on 11/10/2018 22:53:36:

No doubt by now, most people will know that there will not be a 2019 Bristol ME Exhibition.

I have been going over from Ireland to Bristol for a few years as a private exhibitor and was wondering what other similar exhibitions are around for private exhibitors. Ideally, I would like to attend a show that is on for more than one day to make the travelling worthwhile.

Any suggestions (and perhaps an invitation)? I don't do hot fog.

Dave
The Emerald Isle

Where is the news about no Bristol next year?

Steve

Thread: Doncaster show
28/08/2018 22:36:39

Posted by Mark Rand on 28/08/2018 20:34:03:

It isn't the 26th one at Doncaster Racecourse, since it started at Donnington...

cheeky

Err it started at Harrogate.

The one at Donnington was at kenilwirth before that and had aprevious home and is now at foss wayj.

Steve

Thread: What did you do Today 2018
11/08/2018 16:20:19

Posted by Andrew Johnston on 09/08/2018 19:07:37:

Machined the second smokebox door last night. I got a better finish than on the first one, simply by reversing the feed direction from inside to outside to outside to inside:

smokebox door me.jpg

If I'd thought about it that gives a rather better cutting geometry for the tool with less chance of interference, especially near the centre.

Andrew

Was the door a casting or a solid disk of steel.

Steve

Thread: Rear toolpost for parting tool
23/07/2018 12:08:31
Posted by thaiguzzi on 23/07/2018 06:08:48:

Yes, thanx for that, but i'm determined to persevere from the front, using both HSS and tipped tooling. If it worked on a Colchester (yes, i know, mass & rigidity etc), i'll be damned and eventually make sure it will work on a Boxford. No problems on 30-40 mm alloy etc, but the same cannot be said for steel or S/S in the same OD.

I was always under the impression that rear toolposts were designed for Myfords, with their flat ways, and saddle design....

Two experiances that may be related

We had a Colchester Master at work with a rear toolpost carbide insert upside down, reasonable machine but when I tried to part of a load of M24 A4 stainles steel bolts (316) by hand feeding as i worked in design normally but i needed these for a Factory acceptance test the next day, it kept digging in and breaking the tip. This was only cured by using power feed then I did about 50 of them easily.

Now days at home I have a MKII Colchester student, using a front mounted T2 Dickenson toolpost and a Sandvik inserted blade I had digins, changed the toolpost to a create multifix copy now goes through 316L like butter, best on power feed but can do it by hand if you keep cutting.

Couldnt see angy damageon the Dickenson toolpost but the multifix seems far more rigid,

Steve

Thread: Ainjest High Speed Treading Unit on my new Master 2500
14/05/2018 09:13:21

What is not to like about been able to thread at turning speeds?

We had on at work ( old Job ) but threads were far cleaner turned at proper speeds with full form insets in 316 stainless steel.

Steve

Thread: Colchester student cross slide - what bolt threads?
11/05/2018 07:28:34

Probably whitworth if not UNC as per my mk Ii

Steve

Thread: London model engineering exhibition
22/01/2018 15:08:05
Posted by Martin 100 on 22/01/2018 14:24:36:

Anti-dementia time, hopefully someone can help!

Before the 'London' exhibition was at its current location and when it wasn't at Wembley, where was it and in roughly what years?

I know I've been, maybe in the 1980's or 90's, maybe at Olympia?

Before Wembly Arena it was at Picketts lock in two halls.

The other ME exhibition that was last at Brooklands before that Ascott and Sandown Park and before that Olympia when it was with the other magazine interests such as military AFV models, model planes, soldiers and railways etc

Steve

Thread: 1/4 BSP PIPE
22/11/2017 16:46:34
Posted by JasonB on 22/11/2017 16:13:58:

Does 1/4" pipe come in more than one wall thickness. To me it is 1/4" bore and the correct OD to suit 1/4" BSP what other size do you two need?

There is various schedules (wall thickness)

The OD is constant (10.29mm )the wall is described by schedule 10s 40, 40s, 80, etc

Such is the fun between pipe and tube

Steve

Thread: Choosing my first propane torch?
30/06/2017 18:13:29

For £63 Inc vat you can get a complete starter set up at Hamilton or for£74 you can have one with a cyclone burner which are very useful. You can add more burners and neck tubes as you require them, often available on eBay or on special offer at the shows.

Steve

Thread: A moan - steel of mysterious composition
30/06/2017 09:32:24
Posted by jason udall on 30/06/2017 08:52:18:
I find it very surprising that that every component isn't documented down to the batch /cast of the steel.
But maybe the manufacturer didn't feel like shareing with you.

That said more interesting might be the apparent variation of hardness across the section....

Work hardening would be my explanation.
I don't expect any possible effect of radiation but repeated stress might be an intresting essay

Edited By jason udall on 30/06/2017 08:54:54

Why would it be documented to that level?

Its an adjustable bed i would expect most of the parts to be mild steel, might be modern equivalent of EN3 or EN1

Steve

Thread: Knurling wheels help
08/06/2017 22:20:28

Posted by Michael Garbutt 1 on 08/06/2017 19:57:14:

Hi all im half way through building the Hemingway knurling tool but i need some wheels as the ones i have are to wide. any recommendations ? i think they need to be around 1/4 wide and a medium diamond .

Have a look at MSC

`Steve

Thread: How should we describe non-metric tooling?
02/06/2017 21:02:21

Posted by Sandgrounder on 02/06/2017 14:49:24:

At least with all these standards they are in English, the Japanese have to contend with "1/4" Whitworth" in their camera manufacturing industry.

John

Think you will find they have been 1/4 UNC for years

Steve

31/05/2017 22:56:10

Posted by Nick_G on 31/05/2017 22:30:47:

.

The USA as everyone knows still uses the 'imperial' system. But I hear on many Youtube videos them still calling it 'the English system'

While slightly off topic-ish I was taught metric at school but for engineering I feel far more comfortable using Imperial.

Nick

The US term is USCU United States Customary Units which was based on the English units before they were revised to Imperial (1824) and are defined it terms of metric units

Some Americans I have met don't accept the Imperial tag at all.

Steve

Thread: boiler design verification
23/03/2017 20:57:56
Posted by duncan webster on 23/03/2017 13:57:58:

I've done the comparison, and written it all up, but I'm loathe to go public in case someone subsequently sues me! I think SFED and NAME should get off the fence and adopt the Australian code. At the moment we don't seem to have a reference-able criterion. The 'various spreasheets' may well be correct, but on what are they based?

NAME publish a guide on the calculations to be used. it is the same / very similar to one of the books quoted. (cant remember which one) At the time it was done the SFED wouldn't adopt it but at the joint boiler conference I went to it seemed that might move.

If the joint committee only adopted the Australian rules then all the published designs would need reviewing and reworking so i don't see that happening

Steve

Thread: Myford Super 7 screw cutting gears (metric)
12/03/2017 18:23:16
Posted by Otley on 11/03/2017 15:21:30:

Robbo beat me to it, but I'll post this anyway - it's the table I use:

**LINK**

How do the top 3 rows read,

The Metric and BA is clear, but haven't sussed the top three rows.

Steve

Thread: Beyond my skill level!
27/02/2017 22:31:06

Posted by Geoff Theasby on 27/02/2017 21:36:57:

  • Norman, the mechanical diff feeds power to the wheel that is slipping. Hence the 'limited slip diff' in sports cars, which avoids this. Electric motors in each drive wheel don't do that, as a DC electric motor draws most current, developing most power at maximum load, ie the wheel that is NOT slipping. This has been the case ever since electric cars existed, about 100 years ago and more. This is also why DC motors are so good for traction purposes, and also why maximum cooling air is required when starting, since the motor is turning slowly, yet drawing maximum current, and getting hot. Hence particularly the air blower noise on Eurostar trains and other such railways.

Geoff

I thought the traction motors were AC or are you referring to motors for fan cooling?

Steve

Thread: Reaming morse taper sockets
26/01/2017 19:00:13

On the web go to Cromwell tools and search taper socket cleaner.

One of these with some solvent on should clean it up so that a better inspection can be done, I have an INT30 version for my mill.

Steve

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