Topic: HMS EXETER BUILD 1939 (Read 67942 times)

mikearace · « **Reply #75 on:** October 31, 2012, 08:51:25 pm »

A real work of art.

John W E · « **Reply #76 on:** November 06, 2012, 08:05:12 pm »

Hi all just a little update – not much progress really – but I have managed to machine the barrels for the guns. Under normal circumstances using the outside workshop is a summer job – but due to needs must – I went in the shed. So, this is a thank you to Mr Haynes who supplied a set of barrels for me – but – sadly they needed too much alteration diameter wise to the barrels he supplied – they were from one of his warships – thank you again Hilary and Mr Haynes for your help.
Anyway – the next thing is I found that mini servos I am using to operate the elevation of the barrels is very jerky – the servo model number is TG9E TURNGY mini servos – they judder a lot when operating, causing the barrels to bounce. Another problem to overcome.
Couple of pics J

Aye
john

Stormbringer · « **Reply #77 on:** November 06, 2012, 08:08:24 pm »

have you tried a servo slow on them ?
you can adjust the speed that the servo moves at with them , primarilly used in aircraft undercarriage servos to give a realistic raise and lower speed
you can use 2 servo's on it

John W E · « **Reply #78 on:** November 06, 2012, 08:11:02 pm »

hi ya there Stormbringer

have a look at the top pic I have put on - on the top right hand corner - its a servo slower from Tecnobots - still no joy - even an ACTion servo slower doesnt do the trick.

aye
john

Stormbringer · « **Reply #79 on:** November 06, 2012, 08:18:55 pm »

ahh right mate didnt realise it was a slow lol , i have 1 on my Airwolf undercarriage ( not that type tho ) and found theres a range of speeds it works great at but if i try to go slower it gets jerky
you arent by chance using helicopter tail rotor servo's ?
they tend to be a faster servo than the collective and cyclic servo's ( they may look exactly the same but will have diferant model numbers )

DickyD · « **Reply #80 on:** November 06, 2012, 08:20:18 pm »

Hi there me old mate, are these the servos that Hobbyking reckon are Precise and jitter free ?

Looks like you might have to use proper ones.

Nice job though.

Colin Bishop · « **Reply #81 on:** November 06, 2012, 08:23:18 pm »

I have a servo that looks like that on the rudder in one of my models. Like yours, it is rather jerky in action in which case the servo slowers will not be effective. looks like you need precision ones as Dicky says.
Colin

John W E · « **Reply #82 on:** November 06, 2012, 08:47:59 pm »

hi there,

I have another couple of mini servos I am going to test out. I have just done a quick websearch on other Servos. Dicky can you send me a link to the precision servos that you tried to post - I can have a look at them as well.

My good wife has just told me (in her great wisdom) that I should stick to marine servos and not aero servos - help - she isnt right is she?

aye
john

RAAArtyGunner · « **Reply #83 on:** November 06, 2012, 09:01:43 pm »

John,
Now you really are in trouble, if you have not learned SWMBO is Never wrong.

DickyD · « **Reply #84 on:** November 06, 2012, 09:04:23 pm »

Try here me old mate.

http://www.cornwallmodelboats.co.uk/acatalog/hitec-servos.htm

Haven't found a link for a second mortgage yet.

Stormbringer · « **Reply #85 on:** November 06, 2012, 09:14:29 pm »

try this 1
http://www.cornwallmodelboats.co.uk/acatalog/hitec-servos.html
he missed the l out when he copy pasted it

DickyD · « **Reply #86 on:** November 07, 2012, 06:55:24 am »

Quote from: Stormbringer on November 06, 2012, 09:14:29 pm

try this 1
http://www.cornwallmodelboats.co.uk/acatalog/hitec-servos.html
he missed the l out when he copy pasted it

Bug*er, you are right of course.
Oh to be young again.

John W E · « **Reply #87 on:** November 07, 2012, 08:09:10 pm »

Thank you for the links

worked it out - it would cost about £75 quid for three decent servos - yikes

But whilst medling about this affi I found that it was the actual barrels that were amplifying the jerkiness/bounce and by placing a small weight on the end of the gun barrels, it stopped most of the jerkiness. So, now I have to work out how to introduce some resistance to the barrel elevation mechanism. Even though the linkages are all neat and tight - so I know that aint part of the problem - oooo isnt modelling fun.

Think I may copy me wife and take up knitting

john aye

Capt Podge · « **Reply #88 on:** November 07, 2012, 09:22:10 pm »

Quote

Think I may copy me wife and take up knitting

NOOO ! Don't do it John - I've seen some of your jumpers

Regards,

Ray.

Stormbringer · « **Reply #89 on:** November 07, 2012, 10:22:38 pm »

Quote from: DickyD on November 07, 2012, 06:55:24 am

Bug*er, you are right of course.
Oh to be young again.

lol i wish
im 54

RAAArtyGunner · « **Reply #90 on:** November 07, 2012, 10:32:25 pm »

Quote from: bluebird on November 07, 2012, 08:09:10 pm

Thank you for the links

worked it out - it would cost about £75 quid for three decent servos - yikes

But whilst medling about this affi I found that it was the actual barrels that were amplifying the jerkiness/bounce and by placing a small weight on the end of the gun barrels, it stopped most of the jerkiness. So, now I have to work out how to introduce some resistance to the barrel elevation mechanism. Even though the linkages are all neat and tight - so I know that aint part of the problem - oooo isnt modelling fun.

Think I may copy me wife and take up knitting

john aye

Seems like you may have to replicate the real thing to some degree.
Guns, have a breech which is heavy, at the rear, and if not sufficient in weight to counterbalance the length of barell, then additional ballast weight is added to "balance" the barell making it easier to elevate or depress.

Without getting into levers and fulcrums the further the barrel end is from the pivot point (trunnion) the more weight, heavier breech, is required to counterbalance it.

Richtea · « **Reply #91 on:** November 07, 2012, 11:14:55 pm »

Think I may copy me wife and take up knitting

Word of advice, woollen ships tend to shrink and lose their shape.

John W E · « **Reply #92 on:** November 11, 2012, 08:22:58 pm »

Quick update on Exeter’s guns.
Hi ya, reduced the judder on the barrels tremendously, did this by adding side cheeks of thin ply either side of the barrels – round about where the pivot point is. Now quite happy with them after much trial and error trying to synchronise the turning and lifting of the barrels.
That is mainly to do with electronics now – so in the process of building the outer shielding of the turrets. This is from 1:32 ply which will either be sheathed in Lithoplate or very thin plasticard.....
Hey ho....
Aye
John

John W E · « **Reply #93 on:** November 19, 2012, 06:30:20 pm »

ho ho ho happy Christmas, got ya thought I would get it in first hahaha

finished making me 8 inch main aramament for me Exeter

Covered the exterior of the gun mounts with 1/64 thickness plywood and then applied very thin plasticard - which was embossed with rivet detail which I did with the old alarm clock cogwheel

Moving on to make a few more fittings, such as the crane - couple of pics

hey hoSanta is on his way

aye
john

DickyD · « **Reply #94 on:** November 19, 2012, 07:31:12 pm »

Happy Christmas to you John.

Nice guns.

Can you Skype me tomorrow please ?

John W E · « **Reply #95 on:** December 06, 2012, 07:22:23 pm »

Hi there all just a quick update:
Starting to add more detail now and a few fittings around the bridge area. I have used/using John Haynes brass etched stanchions at 1:96 scale for all the upper work fittings along with 0.5 round brass rod for the rails.
Couple of pics so far
qaye
john

Colin Bishop · « **Reply #96 on:** December 06, 2012, 08:13:59 pm »

Excellemt John. you are really bringing the old ship back to life.

Colin

Stormbringer · « **Reply #97 on:** December 06, 2012, 09:01:20 pm »

really coming on now

pugwash · « **Reply #98 on:** December 07, 2012, 01:10:25 am »

A really nice model there John - coming along very well

Geoff

timmer · « **Reply #99 on:** December 08, 2012, 10:37:28 pm »

Brilliant work there. The guns look great.

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Author Topic: HMS EXETER BUILD 1939 (Read 67942 times)