sea coast i have a question.

[rampa room artillery]

  can we see a pic of your Eccentric Axle before it was put into the carriage??  I understand what they are spose to look like but never seen yours indetail outside the carriage where all of it is visable?    I will have to build one for the rear of my carriage i am building  and i had a question about the counter hurters in this pic. i fyou can better explan how they work?

http://upload.wikimedia.org/wikipedia/commons/thumb/1/19/BrookeRifle.jpg/300px-BrookeRifle.jpg    I have looked at it in the prints but guess i would have thought it would bind up on the wood and not very well. 

 rick bryan

[seacoastartillery]

     Rick,    We don't have time to disassemble the wheels and axle today on our 100 Pdr. Parrott to get those pics, but at lunchtime I can draw an accurate drawing of the axle with a description of how it works.  The 7" Treble-Banded Brooke Rifle  does not use any eccentric axles, so we don't have any lying around.

     I squinted for quite a while and even put my magnifier on over my glasses and could not make out enough detail to figure out how the counter-hurter in that photo works. 

Back to it!

Tracy

     

[Soot]

Here's a bigger copy, click on the pic for full size.
http://imgur.com/8YT0e
A different one.
http://imgur.com/924Ci
Or this.
http://imgur.com/bu1Qj

[Double D]

Here is an eccentric axle.

[dominick]

Rick,  Here is the set up I used.  Take two larger diameter pieces of round stock that fit holes in your carriage to make the rotation drums.  Drill an offset hole in the round stock for the axle level and weld the assembly.  When the drum is rotated the axle will raise and lower.  Add stops, wheels, and lever hub.  [Position the stops so the axle rotates past the 6 oclock position and the weight of the carriage will prevent the assembly from dropping.]  The lever hub is attached to the tip of the axle outside of the wheel.  You have to calculate the axle so it clears in the up position and engages in the lower position.  Diagram attached.

[Max Caliber]

Here's a bigger copy, click on the pic for full size.
http://imgur.com/8YT0e

That is a very good looking carriage. No metal trunnion sockets/boxes and no paint. beautiful workmanship. English pattern?

There are several eccentrics here on this board

[seacoastartillery]

     There you go, Rick.  Dom's drawing explains the way it works perfectly.  On a seacoast artillery piece, the short, wheel- bearing  axle which protrudes from the larger axle which goes through the carriage cheeks, is just a little bit smaller than the lengthy, cheek axle or hub as he calls it.  The photo below shows what an eccentric axle used on an 1859, Iron, Seacoast, Center-Pintle, Barbette, Carriage looks like before the ends are turned off, two scale dimples, only .040" apart (1/6th of .240" on the original axles) are added and the slots are cut for the keys that holds the wheels on.  Then the hex-shaped end cuts are made to fit the iron, hand-spike, wrench combination.

     As far as the compression brake goes, those photos and drawing thoughtfully provided by Soot pretty much show how that works.  Even the wooden shoe is visible just above the bottom bar on the clamp hardware.  It binds the securely bolted, rail extension piece to the sliding upper carriage transom.

Tracy & Mike



The left hand axle is in the position to have it's wheels engaged with the Chassis rails, ready for the carriage's 'return to battery'. 

The position of the axle on the right is correct for firing the gun, the wheels are retracted up off of the rails and the entire bottom of the left and right cheeks bear on the Chassis rails, in position so maximum friction is caused during firing which stops the carriage's rearward movement within the allotted distance.




P.S.   Double D., sure looks like a 'Crank' to me.  And, you are getting this observation from a 'cranky eccentric', who should know a 'crank' when he sees one!      Tracy

[Double D]

P.S.   Double D., sure looks like a 'Crank' to me.  And, you are getting this observation from a 'cranky eccentric', who should know a 'crank' when he sees one!      Tracy

That is an eccentric axle for a standard wheel and not a eccentric wheel that goes on a straight axle.

[dan610324]

crankshaft to an small model airplane engine  , or ??

[Double D]

crankshaft to an small model airplane engine  , or ??

Like I said eccentric axle for a single wheel and isn't much different than what Dom.  His is a double Wheel.