From: Fred Martin (mung@in-touch.net)
Date: Thu Apr 17 2003 - 14:34:07 PDT
And while we're on the subject of different gears...the straight cut
gear or it's proper name...involute spur gear, 14 1/2 or 20 degree
pressure angle teeth (two types)...in its meshing with the other
gear...the tooth in contact with a tooth on the second gear is more or
less off the tooth before another tooth comes in contact...made them
more noisy than the later helical cut teeth. The helicals had a couple
of teeth in contact at any given time and another just starting and
another just leaving...made them quieter running and distributed the
load on more than one tooth. Read stronger...Kinda neat when you get to
thinking about it. Just a machinists point of view.
One other comment on the crashbox...I built one for a 57 chevy that the
boys took out to the nationals at Indianapolis and won f stock national
record holder. Our version of a crashbox was...we ground out every other
tooth in the forward gears (as I recall...been 40 years) so you could
just jam it in gear. It ate up a bunch of mounted point grinding stones
in a die grinder and I wouldn't want to do it everyday. Fred Martin
David Ball wrote:
> Sorry Steve you yourself say the CCKW has to be double clutched in all gears
> going up that makes it a crash box or in other words if you do not double
> clutch the gears will "crash". The early Clark 5 speed is a crash box with
> beveled gears and dogs these are not syncro's if they were it would not be a
> crash box.
> I did not say bevel cut gear boxes were not crash boxes just that they had
> less crashing.
> I said that Crash box is a generic term given to early boxes with straight
> cut gears but if you want me to put it in specific terms then fine crash
> boxes are any gear box with out syncros there your CCKW has a crash box
> happy.
>
>
> Dave
>
>
> ----- Original Message -----
> From: "Steve & Jeanne Keith" <cckw@attbi.com>
> To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>; "David Ball"
> <vought@msn.com>
> Sent: Thursday, April 17, 2003 10:46 AM
> Subject: Re: [MV] crash box transmissions
>
>
>
>>Not correct.
>>
>>The crachboxes with beveled gears have the dog clutches
>>like the CCKW tranny. The bevel gears create a thrust that
>>would make it jump out of gear if the gear was not locked
>>in place with a snap ring and a dog clutch used for engagement.
>>
>>Steve AKA Dr Deuce
>>
>>----- Original Message -----
>>From: "David Ball" <vought@msn.com>
>>To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
>>Sent: Thursday, April 17, 2003 1:02 PM
>>Subject: Re: [MV] crash box transmissions
>>
>>
>>
>>>Many Early Vehicles have crash box transmissions this a a generic term
>>
> for
>
>>>any gear box with straight cut gears that "crash" when meshed during
>>
>>input.
>>
>>>Later boxes have bevel cut or angle cut gears which mesh with much less
>>>grinding "crashing" during input.
>>>Then the latest gear boxes with syncros have bevel cut gears and the
>>
>>syncros
>>
>>>match the gear speeds at input and solve all "crashing" but some unlucky
>>>miss shift grinding "crashing".
>>>
>>>
>>>Dave
>>>
>>>
>>>----- Original Message -----
>>>From: "Mark Copeland" <copeland313@yahoo.com>
>>>To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
>>>Sent: Thursday, April 17, 2003 6:45 AM
>>>Subject: [MV] crash box transmissions
>>>
>>>
>>>
>>>>I've done some research on the Canadian built Ford F15
>>>>(http://www.autogallery.org.ru/m/cmp15.htm). The
>>>>truck has a "crash box transmission". Could someone
>>>>please explain to me what that is?
>>>>
>>>>Thanks,
>>>>
>>>>Mark J. Copeland
>>>>MVPA #23916
>>>>Webmaster, First Florida Chapter
>>>>Military Vehicle Preservation Association
>>>>http://www.flmvpa.org
>>>>
>>>>
>>>>
>>>>__________________________________________________
>>>>Do you Yahoo!?
>>>>Yahoo! Tax Center - File online, calculators, forms, and more
>>>>http://tax.yahoo.com
>>>>
>>>>===Mil-Veh is a member-supported mailing list===
>>>>To unsubscribe, send e-mail to: <mil-veh-off@mil-veh.org>
>>>>To switch to the DIGEST mode, send e-mail to
>>>
>><mil-veh-digest@mil-veh.org>
>>
>>>>To reach a human, contact <ack@mil-veh.org>
>>>>
>>>===Mil-Veh is a member-supported mailing list===
>>>To unsubscribe, send e-mail to: <mil-veh-off@mil-veh.org>
>>>To switch to the DIGEST mode, send e-mail to
>>
> <mil-veh-digest@mil-veh.org>
>
>>>To reach a human, contact <ack@mil-veh.org>
>>>
>>
>>
>
> ===Mil-Veh is a member-supported mailing list===
> To unsubscribe, send e-mail to: <mil-veh-off@mil-veh.org>
> To switch to the DIGEST mode, send e-mail to <mil-veh-digest@mil-veh.org>
> To reach a human, contact <ack@mil-veh.org>
>
This archive was generated by hypermail 2.1.4 : Wed Apr 23 2003 - 13:30:51 PDT