Heljan 7mm Hymek

[RedgateModels]

Could someone with a Heljan 7mm Hymek please measure up the front marker lights for me, looking for overall diameter not including the flat top bit of the base and the diameter of the flip up bit would be nice too.

 

 

 

Going to make a master to possibly cast some in resin for my Triang Big Big conversion

 

TIA

 

Ian

Edited January 9, 2023 by RedgateModels

[peter220950]

Hi Ian,

 

Attached is a pic of the main dimensions from the Heljan Hymek,

 

 

The overall width is 4.4mm, and the height 4.64mm, the hinge is 3.01mm wide.

 

The lamp is 3.50mm diameter and the taper starts at 3.00mm, tapering down to the 2mm tower LED opening.

 

Hope this helps, if you give it a day or two I will see if I can get a mould from the actual loco, it would be easier in the long run if it can be done.

 

Peter

[norman]

Could someone with a Heljan 7mm Hymek please measure up the front marker lights for me, looking for overall diameter not including the flat top bit of the base and the diameter of the flip up bit would be nice too.

 

DSCF2504.JPG

 

DSCF2505.JPG

 

Going to make a master to possibly cast some in resin for my Triang Big Big conversion

 

TIA

 

Ian

Hi Ian

Wouldn't you be better getting the dimensions off the real thing rather than copying Heljan.

Norman

[RedgateModels]

many thanks for the kind offer Peter

 

Good point Norman, already on this with someone who volunteers on the WSR, however I think Peter's solution will be the best if it works out

[peter220950]

The best way would undoubtedly be a full sized one, measured, then 3D printed, because as I have now discovered they are tiny!

 

Early indications are promising, a piece of tube was glued to a lolly stick as formwork,

 

 

This was then clamped to the buffer beam, and sealed down with Vaseline

 

 

And filled with RTV rubber

 

 

Making a small mould

 

 

Which was then filled with a spot of resin

 

 

That gives something like the desired item.

 

 

I have a suspicion that they are handed, to counteract the curve of the front, so I will have a bash at the other side tomorrow, and try to figure out how to drill them out, they are so small I can hardly see them to clean them up!

 

Peter

[RedgateModels]

You're a star Peter

[RedgateModels]

and don't worry about drilling them, I can do that when I fit the LEDs

[peter220950]

Yes, I having made a couple more yesterday I think fixing them, then drilling is likely to be the best option anyway, as they are too small and thin to be able to hold them in a satisfactory manner.

 

As I mentioned they are handed, and also have a top to bottom slope as well, to compensate for the slope on the front of the cab.

 

A further complication I hadn't bargained for is the setting time for the resin, which normally goes off within a few minutes. Presumably because there's only a tiny spot involved there's no heat being generated as in the normal sized casts, and it's taking anything up to a couple of hours to go off, while the surplus mix has hardened in minutes.

 

I now have the right hand sides done, but we're away from home until Wednesday, when I hope to get the left hand ones moulded and cast, so apologies if it's holding things up, they should be with you by the weekend.

 

Peter

[RedgateModels]

LOL, it wasn't a "hurry up" post, weekend's fine

[RedgateModels]

Quick update:

 

here's Peter's excellent castings all fitted and drilled to take 2mm "lighthouse" leds

 

 

Now to mask off that warning panel, how I'm going to do the curved tops is beyond me at the moment ... LOL

Edited January 9, 2023 by RedgateModels

[21C123]

Hi all

 

I have recently bought a secondhand o gauge hymek, but it doesn’t have the instructions or head code sheet with it.

 

Does anyone have a copy of either or both they could scan for me please ?

 

I’m wanting to dismantle the bogies as there is at least one with a split gear, it’s making a thump as it moves along.

 

Thanks

 

Roger