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Member postings for David Marks 1

Here is a list of all the postings David Marks 1 has made in our forums. Click on a thread name to jump to the thread.

Thread: Cutting Plasticard Advice
07/02/2021 11:22:22

Chris - Something to add. As with any cutting process you will end up with "burr" on the cut edge. With Plasticard the removal of the burr is very easy. A piece of metal e.g. the edge of a steel rule just drawn lightly along the edge and the burr just falls away.

07/02/2021 09:44:35

Chris - For cutting Plasticard you need a straight edge (steel rule) and a SHARP knife of you choice e.g. Swann-Morton. Score the material along the line of the cut which causes a weak point and the snap along the line. Thin Plasticard can be cut with scissors. Internal apertures can be formed by chain drilling and the filing out to size. Depending on the size of the piece files can be from 6 inch in length to needle files. I also used emery/abrasive sticks (nail files) used for trimming finger nails can also be used.

Thread: Maxwell Hemmens Caton - fittings thread sizes?
01/02/2021 15:01:49

Martin - Having converted your metric diameters to imperial, all the sizes are too small to be BSP at least in the Zeus tables the smallest recorded is 1/8 BSP 0.383 inch which is 9.7mm. There is a possibility the threads are BA, in descending size order 0BA, 1 BA and 4 BA. From thread tables that I have, the corresponding Major Diameters are 6.0, 5.3 and 3.6. If you would like to send me your email address via a PM on here I will supply you with a document which I prepared for my local model boat club entitled Thread Identification. This has info diameters, pitches etc for the BA range.

Thread: Bending 5mm brass rods to make driveshaft
31/01/2021 20:31:14

Firstly the brass needs to be annealed (softened). This will make the bending easier, provide a sharper bend radius and greatly reduce the risk of the material fracturing whilst producing the bend. You will need a small butane powered torch to heat the brass to a very dull red. To produce the bend (as previously stated) you need to make a bending tool. If you have a lathe or know someone that has, drill a couple of pieces of 10 mm bar with a 5mm dia hole through each, One bar is held in a bench vice and the other used to bend the brass into the correct angle.

Thread: Maxwell Hemmens Caton - fittings thread sizes?
31/01/2021 11:41:11

Do you have a means of checking the thread outside diameter and pitch.? The threads are possibly BSP.

Thread: Sarik Styrene Hulls
20/12/2020 21:09:42

I have built the tug Plaudit from a vac formed hull purchased from Sarik. No idea of the thickness but certainly thick enough not to distort, especially when considering that the area most likely to flex/distort is where the batteries sit.

Thread: MV Oldenburg 1/48th scale
30/11/2020 14:16:17

Ray - The hulls are 1/16 birch ply. Each hull is split into three distinct areas which (rightly or wrongly) I term the Upper, Middle and Lower Chines, so there is a possibility I could cover each area separately. The outer faces of each hull also have two substantial Rubbing Strips to contend with.

30/11/2020 08:10:05

Ray - Looking at the images of covering the hull with glass cloth. Was the covering added as one piece or two i.e. port and starboard? I am about to try for the first time covering a hull in cloth (1.0 oz, plus Aeropoxy). Slightly more complex as it is a catamaran hull so the cloth will need to be added in several pieces. Regards - David Marks

26/11/2020 16:49:38

Regarding SLEC - Order for some 1/32 ply, strip-wood and some adhesives placed Sunday evening and to my amazement package arrived mid morning on Wednesday. I have purchased ply many times before and this time the ply was so snug in its packaging, I had to carefully cut all the packaging away to release the ply. Service and standard of packaging as always, very good.

Thread: Gorilla Wood Glue
15/11/2020 08:36:33

Has anyone tried this product? I have been using aliphatic type PVA for some time and been very pleased with it, but my current supply which is from the Jim Perkins (JP) range is about to run out . The advantage of the Gorilla brand is that it is about 50% cheaper and more readily available i.e. it is stocked by my local Srewfix.

Thread: Machine Tools
23/10/2020 11:04:49

Regarding the tube, what is the critical dimension, the outside or inside diameter? I used to turn copper tube for a bloke that made hot air engines which requires the tube to have a thin wall thickness. The way around that one was to find a tube with the correct i/d and after mounting on a mandrel turn down the o/d to the correct size. It also overcame the problem that you find with most tube i.e. the i/d and o/d are not concentric.

Thread: making rudders
02/10/2020 11:18:00

Steven. Perhaps you could explain what you mean by the term "stock"

Thread: Machine Tools
12/09/2020 11:56:27

Dave - Regarding the "play" that you have found. Please note that all devices that rely upon a screw and nut system to provide movement will have a degree of play otherwise movement would be impossible i.e. like a fully tighten nut and bolt. The free-black experienced when changing direction just needs to be taken into account.

Thread: Dolphin Yard Sailing Barge Museum
28/08/2020 19:57:08

Ray - Well done, that was quick work. From the discussion that I had yesterday with the Chairman of the museum, there is also a proposal to have a boating pond facility for the younger generation to get some "hands on" rather than just viewing items in a showcase. I am not sure but it may allow the formation of another model boat club or at least generate some enthusiasm from the younger generation to build and sail a model boat.

Thread: Machine Tools
28/08/2020 19:50:52

My background is in the mechanical engineering workshop field. Consequently (apart from model boats) I involve myself in mechanical items and spent a considerable time supporting my son who scratch built as Lotus 7 lookalike. So machinery wise I have a pedestal drill (Axminster) combined lathe/milling machine (Chester) and a mini milling machine (Arc Eurotrade). Regarding accuracy, reliability etc, I am very pleased with all of them especially for the price paid. There was an earlier comment about Arc Eurotrade which I fully support. A very good supplier to deal with and the way the mini mill was presented was absolutely superb. If you have a Lidl supermarket near to you have a look at their Parkside range of larger tools. A friend of mine purchased one of their bench drills which I tried out and I found it very good value. Their Powerfix range of smaller hand tools are also superb value …£10 for a 6 inch - 150 mm digital caliper……very good indeed.

Thread: Dolphin Yard Sailing Barge Museum
27/08/2020 16:54:41

I am the chairman of my local model boat club based in Orpington, Kent. The club has been approached by the Chairman of Dolphin Yard Sailing Barge Museum located at Sittingbourne, Kent. The museum has been donated a number of model sailing barges to use as exhibits but these require a degree of refurbishment. If anyone residing in that area is interested in volunteering then please send me a p.m. and I will provide contact details.

Thread: Adhesive
04/08/2020 07:12:07

Colin - Yes you are correct about Shop4glue now being based in Bulgaria however their website which was dormant for a long time is now up and running and you can now purchase products for shipment to the UK. Never purchased from them by this method, only from their stand at the Warwick show.

03/08/2020 22:28:01

I normally scratch build - wooden hull and Plasticard superstructure. I use an Aliphatic type glue for the wood and solvent weld the Plasticard. I find the glues available from Shop4Glue to be very good. They sell Aliphatic and their brand name for the solvent is Polyweld. The latter is the best solvent glue that I have ever used.

Thread: Alignment tools
03/08/2020 16:49:42

Neil - If you do not get any joy from Dave Milbourn's suggestion try your local model boat club or model engineering club/society. I have made bits (including alignment tools) for club members and just get them to put a donation in the Rescue Boat which is my clubs collection box, with donations going to off-set the cost of pond hire and insurance.

Thread: Engine mounting
16/07/2020 13:08:20

The red plastic coupling (trade name Huco) should be set up so that both halves are on a common axis. To do this I replace the plastic piece with a dummy body (made from aluminium bar) of the same length and bore size so that it accepts the two brass inserts. Once alignment is achieved the dummy body is replaced by the red plastic section.

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