Author Topic: Scale hex nuts  (Read 3666 times)

Offline iosens

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Scale hex nuts
« on: November 27, 2017, 03:20:56 AM »
Hi I am trying to build a stem engine with about 1.5 X 2.5 inch cylinder.

Wondering about the best (roughly) correct bolt and nut sizes for the cylinder covers,
#00- 80, 1.6 mm 1.8 mm, 2mm....

In some of the models I have seen the nut look oversized.

I see that there are also special "extra high" model nuts available in different (mostly metric) sizes.

M2 would probably the easiest to work with.

Just very unsure about it.

Thank you!







Offline crueby

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Re: Scale hex nuts
« Reply #1 on: November 27, 2017, 03:33:51 AM »
The size would depend a lot on the scale of the model vs the full size engine. Is yours of a particular engine?
A lot of modelers cut their own from hex bar to get the look correct.

Offline paul gough

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Re: Scale hex nuts
« Reply #2 on: November 27, 2017, 04:30:16 AM »
Nut and bolt head sizes also depend a bit on the period you wish to imitate. Very early stuff might have square heads. Hex. heads can vary depending if they were individual manufacturers sizes or a 'standard' size, but even these standard sizes get altered to new standards, often reduced, as Whitworth did due to metal saving in the war. If you are not following an exact prototype known to be in original condition and want things to 'look right' it might help to take a look at quite a few photos of engines of similar type from the period you wish to copy and note the proportions and the number of bolts or studs on cylinder covers and approximate these. Also if you can visit a museum and look at original engines or if you are lucky, can view models made in the period of interest you will soon get a feel for what suits.  Regards, Paul Gough.

Online Jasonb

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Re: Scale hex nuts
« Reply #3 on: November 27, 2017, 07:35:18 AM »
As said a lot will depend on the particular engine and the scale you are making it to, I have ones with that size cylinder and there are just 4 studs holding the cylinder in place, I also have a similar size engine with 24 studs so they have to be smaller. the one with 4 studs is 2/3rd full size, the one with 24studs is 1/12 scale.

If you are in Europe then GHW do some very nice small hex metric fixings which are typically one ISO size smaller eg M3 nut will be 4mm hex rather than 5.5mm

http://www.modellbauschraube.de/download/index.php

This shows the small head M4 and M3 nuts with standard ones in the middle


Offline gerritv

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Re: Scale hex nuts
« Reply #4 on: November 28, 2017, 01:49:39 AM »
https://www.microscrews-shop.nl/ has excellent machined nuts and bolts. Not pressed/punched metal.
John speaks/writes fluent English so no language barrier.

rvs=stainless, messing=brass, staal=steel, hoog=tall, laag=low

Gerrit

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Offline iosens

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Re: Scale hex nuts
« Reply #5 on: December 02, 2017, 10:25:25 PM »
Thank you very much

Unfortunately there are no museums of this sort in the South of the US.
They seam to be abundant in Britain and some are in the northern states, too.

Guess I have o look at some Muncaster plans.

My cylinder has a 30mm bore and a 8 mm "flange" (rim?), I guess a 3mm or even 3.5 mm nut will not look out of place, which then means M2 or even  M2.5.

On the other hand if this would be a 1/12 scale model, the cylinder would be 36 cm (14,4") the bolt would be 24mm
(1") and the nut 36mm (1.4") - is this still reasonable ?




Offline Walsheng

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Re: Scale hex nuts
« Reply #6 on: December 03, 2017, 01:49:18 AM »
If you are in the US then these folks have a nice selection of model hardware:
http://www.americanmodeleng.com/index.html
I have no affiliation, just a satisfied customer.

John

Online Jasonb

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Re: Scale hex nuts
« Reply #7 on: December 03, 2017, 07:38:17 AM »
How many nuts do you want to put around the cylinder as that has a lot of effect on the size to use.

Offline iosens

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Re: Scale hex nuts
« Reply #8 on: December 03, 2017, 11:41:18 PM »
I guess 6 nuts would be enough

Online Jasonb

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Re: Scale hex nuts
« Reply #9 on: December 04, 2017, 07:40:03 AM »
In that case I think M2 or M2.5 threads will look a bit small. You will probably nee dto go to M3 fixings

This is a 24mm bore, 40mm dia cylinder end cover with M2.5 threads and the nuts I showed above which are are 3.5mm A/F



And same size fixings on a 38mm cylinder cover


Offline Dan Rowe

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Re: Scale hex nuts
« Reply #10 on: December 04, 2017, 02:36:22 PM »
+1 for American Model Engineering Supply.

As you are in the US the first thread standard was the Sellers thread. The formula for the AF (across flats) dimension is 1.5 times the bolt diameter plus 1/8". As this is not a linear progression it does not scale well. My rule of thumb is about what they did at American Model Engineering Supply that is 1.5 times the thread diameter and take the next biggest hex size for the AF.

There is a thread for scale fasteners here:
http://www.modelenginemaker.com/index.php/topic,628.0.html

Dan
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Offline crueby

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Re: Scale hex nuts
« Reply #11 on: December 04, 2017, 02:45:39 PM »
Does AME have a new website address, with the new owner? The website does not look to have been updated in over a year, price list is from 2016. Anyone order from them in 2017? I got some great stuff from them in the past - only place I could find with stainless steel hex nuts/bolts in 3-48 thread.

Offline gerritv

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Re: Scale hex nuts
« Reply #12 on: December 04, 2017, 02:52:43 PM »
I think this will answer your question: http://www.godshallscustommachining.com/american-model-engineering-supply.html. Basically they are keeping the same web site address.

There is a note somewhere on the ASME site that they are working on a 2017 price list.

gerrit
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Offline Flyboy Jim

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Re: Scale hex nuts
« Reply #13 on: December 04, 2017, 03:09:33 PM »
Does AME have a new website address, with the new owner? The website does not look to have been updated in over a year, price list is from 2016. Anyone order from them in 2017? I got some great stuff from them in the past - only place I could find with stainless steel hex nuts/bolts in 3-48 thread.

I ordered a bunch of stuff from the new owners last spring. Worked out well.

Jim
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Offline crueby

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Re: Scale hex nuts
« Reply #14 on: December 04, 2017, 03:36:14 PM »
Great! Thanks guys!