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Member postings for GordonH

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

Thread: Loco wheels cast iron grade ?
10/09/2019 09:00:22
Posted by Michael Gilligan on 10/09/2019 07:25:41

What, then, does the word ductile mean in relation to the thousands [probably millions] of iron grids and covers in our roadways etc. ?

Michael,

When a heavy load passes over a grid or a cover, bending occurs about the neutral axis. In the case of a grid, the underside of the bars is in tension, for a cover, the tensile load is in the underside of the webs. In both cases, the SG iron's superior tensile strength leads to another of its superior properties, improved fatigue strength. Without this, fatigue failure would eventually occur.

Jason was quicker typing than me.

Gordon

Thread: Suitable wood for making tool holders
25/06/2019 17:04:03

Hi,

I have purchased an automatic boring and facing head. Unfortunately, the storage box has been "butchered" by a previous owner. One of the removable shelves is missing and a support for the boring head shank has been removed. To stop various items rolling around, I would like to make a replacement shelf and support.  I know that using Oak is not not recommended, what timber, available in the UK would members recommend me to use?

Thanks for any advise offered,

GordonH

Edited By GordonH on 25/06/2019 17:06:01

Thread: 4 jaw chucks
09/06/2019 12:42:16

Arckivio,

Google d1-3 flange dimensions, they are very similar. My Myford has a BS4224 fitting, 3 mounting studs. It takes D1-3 chucks with the camlock fittings replaced by threaded studs. I bought these years ago from the old Myford in Nottingham.

GordoH

Thread: What DRO to get?
18/04/2019 14:12:57
Posted by ken king, King Design on 18/04/2019 11:55:58:

Garry mentioned hearing of someone who was able to fit scales to both quill and table raise/lower, and have them combined as the Z-axis readout. I asked if this was possible but both suppliers apologised and said it wasn't. It's something to think about though.

See https://www.machine-dro.co.uk/m-dro-linear-encoder-summing-interface.html for combining quadrature interfaces

GordonH

Thread: Myford 254s accessories ?
24/03/2019 22:16:03

Karl,

Do you have a manual for your lathe? If so, page 15 onwards lists the range of Imperial and metric threads which you can create by fitting different changewheels driving the screw cutting leadscrew.  You do not need a conversion kit, just a few changewheels and possibly a stud to fit an additional changewheel.  Parts are available from Myford or other sources.

If you do not have a manual, pm me your email address and I can send you a copy of the relevant pages tomorrow.

I use tailstock tap or die holders for almost all of my threading.

Gordon

Edited By GordonH on 24/03/2019 22:25:44

Edited By GordonH on 24/03/2019 22:48:14

Thread: Vertical Boiler - blower?
14/03/2019 16:47:09

If you need the fan to get a decent flame and without it you suspect incomplete combustion, I'd suspect you may have insufficient air supply to the burner, or insufficient chimney area.

Gordon

Thread: Workshop - indoors or outdoors
26/02/2019 20:29:28

My insurance company (NFU Mutual) would only cover an outbuilding to a maximum of £10,000, but would happily cover engineering equipment over that value in my garage which is integral to the house.

Gordon

Thread: Silver steel or stainless?
25/01/2019 12:17:24
Quote from Michael Gilligan:- The clearance hole is in the casting ... How sure are you that it's coaxial with the pushrod ?

From the picture and the lack of information to the contrary, I assumed that the desiner had done a competent job and lined them up

Never done a quote before, I hope that my text isn't added to the quoted text Edited to attribute quotation
Gordon

Edited By GordonH on 25/01/2019 12:21:40

25/01/2019 11:36:07
Making a bush for the 6 mm rod would help reduce the bending moment. I wouldn't bother though, I would turn down a larger rod to a sliding fit in the hole then drill and tap the end 3 mm. A 3 mm high tensile grub screw or bolt loctited in would be better than a turned thread.
Gordon
Thread: Not a new member, but I rarely post!
22/01/2019 20:46:18
Maybe a little earlier Neil, I'm already thinking of starting another thread in a month or so.
Gordon
22/01/2019 11:34:00
NDIY,
Thanks, it was September 2018, so fairly recent.
22/01/2019 09:34:53
Hi, I've hung around this site for years, but only made one other post so far. My main modeling interests are steam engines and machine tools.
I have various ongoing projects including a Stuart 10V, gauge one and a 3 1/2 inch Conway locomotives. I'm also renovating a Sigma Jones jig borer and thinking of using this to experiment with CNC Control.
Thread: Efficiency - how measured, exactly ?
30/09/2018 12:31:32
Tim,
I am a member of the BSME who organised and ran this year's IMLEC, and I also acted as one the official observers.
Prior the competion run, the drivers choose the quantity and grade (size) of coal that will be required and the number of passengers that they wish to pull during the test run. The chosen number of passenger tickets and the amount of coal, pre-weighed and bagged is then collect and verified. In the Steaming Bay, charcoal is supplied for steaming the engine. At the start of the competition run, the engine is taken to the traverser, for transfer to the running track. At the traverser, the driver must stop adding charcoal and begin to use his coal supply Once on the running track, the dynamometer car (loaned by Leyland SME) is connected and calibrated, together with the chosen number of passenger trucks. The train is then driven to the station where the selected passengers board and the test run begins.
At the start of the test run, the timekeeper starts the clock and begins the lap count. Each run must be for a minimum of 25 minutes. After this time, the the driver may stop or carry on. After 30 minutes,the driver must not begin another lap but if part way around is able to complete the lap.
At the end of the run, the unused coal (any coal which has not entered the firebox) is weighed. The difference between the starting and finishing weights is then used in the efficiency calculation. No allowance is made for any energy remaining in the firebox, or for coal which may have passed through the firebox without being burned. The former is down to the skill of the driver, the latter is part of the engines efficiency. In practice, many drivers finished with no fire in the firebox, and little residual boiler pressure. This was down to the driver judging when to stop coaling.
The overall efficiency is calculated from the speed and load data from the dynamometer, the distance travelled and the overall time , the amount of coal used and the calorific value of the coal. This calculation wash previously discussed in a thread on this forum be David Clark in January 2012.
https://www.model-engineer.co.uk/forums/postings.asp?th=64687
Gordon Halliburton
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