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I read the book Model Submarine Technology. I have a new appreciation of the delicate art of balancing a submarine.
Still looking for a how to on the spindle part of the piston.
Still looking for a how to on the spindle part of the piston.
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Piston Ballast Systems
salmon- AMS Forum Owner
- Posts : 312
Join date : 2011-09-02
Age : 64
Location : Las Vegas, Nevada - USA
salmon- AMS Forum Owner
- Posts : 312
Join date : 2011-09-02
Age : 64
Location : Las Vegas, Nevada - USA
Nigel,
950D61 is ordered!
950D61 is ordered!
Last edited by salmon on Fri Nov 18, 2011 11:30 pm; edited 1 time in total (Reason for editing : spelling)
david f- AMS Treasurer
- Posts : 2412
Join date : 2010-11-10
Age : 74
Location : Cumbria
I recognise that number. An MFA/Como geared motor.
Good choice Sir!
Good choice Sir!
salmon- AMS Forum Owner
- Posts : 312
Join date : 2011-09-02
Age : 64
Location : Las Vegas, Nevada - USA
Yes sir, it is! I asked Nigel for a parts list and he mentioned beginning with this.
_________________
If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.
salmon- AMS Forum Owner
- Posts : 312
Join date : 2011-09-02
Age : 64
Location : Las Vegas, Nevada - USA
sorta bump -
Can anyone help me with building a piston ballast system? Does anyone have a working or broken piston system they want to sell?
Can anyone help me with building a piston ballast system? Does anyone have a working or broken piston system they want to sell?
_________________
If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.
nigele(ADMIN)2- AMS Chairman
- Posts : 1107
Join date : 2010-11-06
Age : 70
Location : Braintree, Essex
mark up with a felt tip pen a piece of 1/16 x3/4 (approx) brass sheet,take a MFA 950D 6:1 gearbox unit,remove gearbox from motor,mark on the gearbox case as shown all spindle holes that are in use.
nigele(ADMIN)2- AMS Chairman
- Posts : 1107
Join date : 2010-11-06
Age : 70
Location : Braintree, Essex
mark a centre line along the brass strip,and then with a square mark a line one inch from the end as shown.
nigele(ADMIN)2- AMS Chairman
- Posts : 1107
Join date : 2010-11-06
Age : 70
Location : Braintree, Essex
arrows showing used holes on the drive side of the mfa gearbox.
nigele(ADMIN)2- AMS Chairman
- Posts : 1107
Join date : 2010-11-06
Age : 70
Location : Braintree, Essex
arrows showing used holes in rear case of gearbox.
nigele(ADMIN)2- AMS Chairman
- Posts : 1107
Join date : 2010-11-06
Age : 70
Location : Braintree, Essex
gentle prise gearbox apart keeping the three brass spacers safe.
nigele(ADMIN)2- AMS Chairman
- Posts : 1107
Join date : 2010-11-06
Age : 70
Location : Braintree, Essex
gearbox dissembled,the front case is no longer needed (the one with the large steel bush).
nigele(ADMIN)2- AMS Chairman
- Posts : 1107
Join date : 2010-11-06
Age : 70
Location : Braintree, Essex
rear case with the ideller shaft and bronze bush,this will be used as a drilling template.
nigele(ADMIN)2- AMS Chairman
- Posts : 1107
Join date : 2010-11-06
Age : 70
Location : Braintree, Essex
returning back to the brass strip,at the intersection of the two line previously drawn centre pop and drill a 2.5mm hole.
nigele(ADMIN)2- AMS Chairman
- Posts : 1107
Join date : 2010-11-06
Age : 70
Location : Braintree, Essex
Place the idler shaft in the hole,place the gearbox rear plate on the shaft as shown,drill a second 2.5mm hole using the old gearbox plate as a template (drill through the hole previously marked with an arrow insuring that the hole is on the centre line, I centre pop through the hole just to help keep the drill on the centre line).
nigele(ADMIN)2- AMS Chairman
- Posts : 1107
Join date : 2010-11-06
Age : 70
Location : Braintree, Essex
another view
nigele(ADMIN)2- AMS Chairman
- Posts : 1107
Join date : 2010-11-06
Age : 70
Location : Braintree, Essex
the second hole drilled.
nigele(ADMIN)2- AMS Chairman
- Posts : 1107
Join date : 2010-11-06
Age : 70
Location : Braintree, Essex
now place the gears on the new gearbox plate and check that the mesh feels ok.
nigele(ADMIN)2- AMS Chairman
- Posts : 1107
Join date : 2010-11-06
Age : 70
Location : Braintree, Essex
for the third hole,motor drive messure with a pair of calippers between the ideler shaft hole and the large motor hole on the original gearbox,this needs to be as accurate as poss,but it is ultra crittical.
nigele(ADMIN)2- AMS Chairman
- Posts : 1107
Join date : 2010-11-06
Age : 70
Location : Braintree, Essex
now transfer the calipers to the brass gearbox plate mark centre pop and drill another 2.5mm as shown.
nigele(ADMIN)2- AMS Chairman
- Posts : 1107
Join date : 2010-11-06
Age : 70
Location : Braintree, Essex
now mark a line and cut of at around three inches,as shown.
nigele(ADMIN)2- AMS Chairman
- Posts : 1107
Join date : 2010-11-06
Age : 70
Location : Braintree, Essex
now cut another plate the same as the first.
nigele(ADMIN)2- AMS Chairman
- Posts : 1107
Join date : 2010-11-06
Age : 70
Location : Braintree, Essex
as with the first plate mark a hole 1inch from the end drill a 2.5mm hole,put the idler shaft in the hole lay the first plate on top of it clamp together and thansfer all the holes to the second plate.
nigele(ADMIN)2- AMS Chairman
- Posts : 1107
Join date : 2010-11-06
Age : 70
Location : Braintree, Essex
holes transfered to second plate.
salmon- AMS Forum Owner
- Posts : 312
Join date : 2011-09-02
Age : 64
Location : Las Vegas, Nevada - USA
Nigel,
Thank you!
This is so exciting!
Peace,
Tom
Thank you!
This is so exciting!
Peace,
Tom
_________________
If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.
nigele(ADMIN)2- AMS Chairman
- Posts : 1107
Join date : 2010-11-06
Age : 70
Location : Braintree, Essex
now take a 4mm dia prop shaft (the dia of the inner shaft),the type with top hat bearing's,knock out the bearings and put the outer shaft aside to be used later,the inner shaft is not used.
drill out the first hole in the gearbox plates to match the bearing dia,in this case it was .250 inch.
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