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Member postings for Greensands

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

Thread: Query copying images from Truview
16/08/2022 19:04:45

Hi All - Following the above threads I have installed LightShot which appeared as an option from downloading GreenShot and this has given the means of 'grabbing' the TruView drawings which have now been copied to my phone. Many thanks for all the help and assistance provided.

16/08/2022 16:43:59

I am using AutoCad Truview on my desktop PC to display and print my workshop drawings but have been left wondering if there is a means of copying and saving-as the images in an alternative format in order to be able to view individual drawings on my phone. Perhaps someone could advise on the options available.

Thread: Alternative methods to using abrasive blasting to achieve a paint key
14/08/2022 17:22:08

Dave - Have now ordered some P360 Mirka Mirlon Scotch Brite pads to try out on my steel smokebox.

14/08/2022 09:43:29

I think the problems with going to a local concern are essentially two fold. 1) They have to be able to fit your essentially one-off job into their batch run orientated system and 2) Potential issues as they see it of your job contaminating their plant.

14/08/2022 09:19:00

I have been giving some thought to painting my model locomotive and have carefully taken note of the good advice given in Christopher Vine’s book “How (not) to paint a locomotive” in which he strongly advises the use of abrasive blasting to achieve the all important paint key. Even to acquire a basic set-up however involves a fairly expensive outlay to say nothing of the demands on space and safety considerations which does make one ask if there might be cheaper alternative methods of achieving the desired results more suited to those of limited space and budget. I would be interested to hear the views of other model makers faced with similar issues and how they have tacked the problem.

Thread: Don Young Combined Vacuum/Steam Brake Valve - Problems in achieving a tight fit between valve spindle and the steam brake valve
12/08/2022 09:35:05

Hi Julian – Very pleased you have been able to pick up once again on this one. As I understand it, Dons' arrangement for the steam side of the combined brake valve, the so called ‘Limit Valve’ is a dummy fitting with blind perforations and is simply used as a convenient means of getting steam into the brake valve as described in LLAS No.55, Pages 33/34. It does however leave unanswered the question raised in my posting of the 10 Aug relating to the partial uncovering of the steam port when the valve is in the Off position. I need to have another look at his design for E.S.Cox but am under the impression that they were essentially the same design.

Thread: Difficulty in repairing a bonded 5mm green polyurethane drive belt
10/08/2022 20:20:29

I have been using a 5mm diameter round drive belt on my small bench drill made up from a length of green polyurethane drive belting with the ends bonded together in the usual way using the hot plate technique. After giving some 10 years of good service the original joint has now failed but I am having great difficulty in repeating the technique on the same length of belting hopefully to give a new (but shorter) drive belt but happily of a length which can be accommodated in the current set-up.

I am just wondering if this could be a problem with aging of the polyurethane over the 10 years of use because I never seem to have any difficulty when working with a length of new belting material. I would be interested to hear other people’s views on the matter as failing a solution of the problem I will have to resort to buying in a new stock of belting.

Thread: Don Young Combined Vacuum/Steam Brake Valve - Problems in achieving a tight fit between valve spindle and the steam brake valve
10/08/2022 12:27:31

Possibly one for Julian but I am open to all suggestions. Having made up the brake valve to the DY drawing I have been puzzled by the fact that when the valve is in the closed position, the steam port from the ‘Limit Valve’ is left slightly open thereby admitting steam into the end cap when I would have thought it should be left shut off. A dimensional check reveals that the radius to the outer edge of the steam port = 7/32 + 1/32 = 1/4 = 0.250” whereas the radius of the steam valve = 15/64 = 0.234” which results in a 0.016 overlap all of which seems to be borne out by the drawing.

09/08/2022 18:28:32

Given that the valve assembly will be in contact with hp steam, which grade of Loctite would the team suggest?

09/08/2022 17:09:39

Satisfactory working of the Don Young combined Vacuum/Steam brake as shown on Sheet 11 for his 5”G Black Five is dependent upon achieving a tight fit between the valve spindle and disc making up the steam brake valve. As drawn, this is achieved by means of a 5BA screw thread (see drawing) but I am having great difficulty in achieving a tight fit into the threaded disc. One option might be to use a high temperature/steam resisting grade of Loctite or something similar or, to resort to putting in a few indentations from the reverse side between the spindle and disc using a centre pop However, before doing so I wondered if there might be any other possible alternative solutions to the problem.

Thread: How to draw a set of holes on a PCD using Autocad 2000
09/08/2022 11:49:52

Martin - Problem now resolved using the polar array command.

DC31K - Yes, have also had success selecting the OSNAP NODE option

Many thanks guys.It is a very helpful forum.

09/08/2022 10:27:53

Hi - I am having problems in drawing up a set of holes on a PCD using Autocad 2000. Having successfully DIVided the circle into the required number of divisions I was expecting to be able to ‘snap’ onto the division points to draw the required circle of holes but have discovered that OSNAP settings options does not seem to recognise the DDPTYPE markers inserted using the DIV command. Can someone please explain where I might be going wrong.

Thread: How Much is this Costing Me?
08/08/2022 13:00:26

Has anyone carried out any similar power consumption checks for a Myford S7 when left running at idling speeds? Sorry but can't supply any details on the SP motor to reveal the model/reference number details as this would involve moving the whole ensemble away from the wall and that is a no-no at the moment.

Thread: Modifications to a Sievert 871901 Light Line Burner
03/08/2022 12:03:11

I have always found it difficult to light my Sievert 871901 Light Line Propane Burner, the problem being that without covering the air holes at rear of the burner the rush of the incoming gas extinguishes the igniting flame. The answer has been to roll up a sliding brass sleeve to cover up the air holes for igniting purposes and then to slide it back to expose the holes once the gas stream is alight. No claims to originality but it might just be new to someone and it has certainly has answered my problem. The attached pics shows the sleeve in operation.

Thread: Hermes and couriers
01/08/2022 20:19:21

I have not used Hermes since they changed their name to ENRI but it would appear that they no longer accept Paypal as a means of payment. If this is the case and I would prefer to use a courier who does offer this method payment can anyone recommend some possible alternative services.

Thread: The best advice I was ever given/gleaned - Keep it on the Stock!
01/08/2022 10:40:25

Use sharp drills and reduced speeds when drilling phosphor bronze..............

Thread: Designs for a 1/2" hacksaw blade type parting off tool holder
26/07/2022 18:23:56

Many thanks to all who have responded to my request for some design detail. I am now in the process of making up my own version based upon the ideas shown here.

25/07/2022 16:46:45

Hi Bill - Yes, it is the Chronos unit (or one very much like it) I have tried using to hold an hacksaw blade but the blade is not a comfortable fit and I was hoping for something better.

25/07/2022 15:53:06

Hi all - I have been experimenting with using conventional 1/2"W x 0.025"Thk hacksaw blades for use as a parting off tool with the principal aim of being able to put in a narrow run-out/undercut in various brass steam fittings currently under construction. Problem is finding a design of tool holder suitable for holding a hacksaw blade given that the one I use for the standard Eclipse type parting off blade is not really suitable for the job. Can anyone recommend any more suitable designs for the holder?

Thread: The best advice I was ever given/gleaned - Keep it on the Stock!
23/07/2022 18:18:49

.Having just completed a job on the lathe which involved turning followed by a cross drilling exercise reminded me of the old pearl of wisdom about keeping the piece part on the stock for as long as possible and to leave parting off as the final operation. Never a truer word was spoken

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