Archery Talk Forum banner

What's the diff. between a single cam and a dual cam.

6750 Views 38 Replies 21 Participants Last post by  jkeiffer
Whats the difference between a single cam or dual cam. :dontknow:

Or whats the advantage or disadvantage.
1 - 20 of 39 Posts

· Registered
Joined
·
5,479 Posts
Well not to be insulting but the difference is the number of cams.

Single has one.

Dual has two.

Usually a dual cam is faster.

Usually a single cam is smoother drawing.

Single cams are normally easier to tune, but are normally DL specific.
 

· Registered
Joined
·
5,756 Posts
Discussion Starter · #3 ·
Well not to be insulting but the difference is the number of cams.

Single has one.

Dual has two.
I knew the obvious reasons. single=1 and dual=2.:tongue1:

But i appreciate the other info. :wave3:
 

· Registered
Joined
·
25,353 Posts
dont have to time a single cam and they r smooth.

dual cams r faster but have to be timed.

easier to tune a single cam.

i like both.

its a personal choice.
 

· Registered
Joined
·
4,499 Posts
both bows WILL go out of tune.Dont believe it if someone tells you that you dont have to worry about cam rotation on a single cam cuz its not true.there is nothing wrong with either one its a personal choice on what you want.if you want speed you prolly need to be shooting something with 2 cams on it
 

· Time Flies
Joined
·
13,298 Posts
Single Cam vs. Dual cam

A single cam has one cam and a round idler wheel, where a dual cam setup has two identical cams. Don't believe anyone who tells you that a single cam is easier to tune...any dual cam bow can be tuned (meaning timing and cam rotation) in under 5 minutes. The draw curve really depends on the shape of the cam...so a single cam won't necessarily have a smoother draw than a dual cam. Also, don't believe anyone who tells you that single cam bows are usually draw specific...most bow companies make single cams with modules that can be rotated in a certain position to alter the draw length.
 

· Registered
Joined
·
4,453 Posts
Your General is a binary dual cam , which is different, from most 2 cams.

Look at a Hoyt,or a Diamond Edge for instance and you will see that the cables terminate at the axle and your General ( and other binary cam bows ) string and cables all terminate back at the cam.
 

· Registered
Joined
·
25,353 Posts
they have to be tuned. there is nothing to time it with.

ethier that or the guys at the proshop r lieing to me.

what ever. im not going to start a dumb argument. if im wrong im wrong. im sure my one coment will be taken more seriously then the other 13.
 

· Registered
Joined
·
2,656 Posts
It's not just the module side of the cam that determines the draw, it's the combination of all the string tracks on the cams, as well as the limb angle, that determines the force draw curve.:confused:
 

· Registered
Joined
·
15,839 Posts
It's not just the module side of the cam that determines the draw, it's the combination of all the string tracks on the cams, as well as the limb angle, that determines the force draw curve.:confused:
I agree!! I have shoot about everything. For the average hunter who isn't interested in a lot of speed etc. IMO, the single cam is the better bow and simply has less maintainance to it. The dual cam bow had just about lost the ghost until better string materials became available. This was mainly because they were constantly getting out of time.

Does a single cam bow need timed? NO!!! Timing implies a synchronization between the two cams. Single cam bows have only one cam and therefore, can not be timed. Both the single and dual cam bows need to be tuned. Tuning involves the best position of the cam(s) to provide the best speed. The dual cam bow can be out of tune, but still in time. The single cam bow can be out of tune, but never out of time.

What almost killed the use of the dual cam bow was cable stretch. If one cable decides to stretch a little more than the other then the nock point on the string would move and the bow's accruacy would change very dramatically and rather quickly. Where as, if the single cam string and/or cable stretched this only resulted in a loss of performance or tune but, accuracy really remained almost uneffected.

The binary cam is a dual cam but has one advantage over the traditional dual cam bows. Once the binary cam is timed and tuned then any cable stretch is averaged out over the two cam and the bow remains basically in time and effects the nock travel very little. The binary however lost one advantage over the dual cam bow and that was the ability to control cam lean.

With today's more stable string materials we are seeing a ressuration of the dual cam for speed, etc. Without it, the dual cam would have died. I can't really say which one is better. The dual cam usually is more adjustable and has many other advantages. The single cam on the other hand is less adjustable and therefore somewhat more reliable.
 

· Registered
Joined
·
1,211 Posts
Does a single cam bow need timed? NO!!! Timing implies a synchronization between the two cams. Single cam bows have only one cam and therefore, can not be timed. Both the single and dual cam bows need to be tuned. Tuning involves the best position of the cam(s) to provide the best speed. The dual cam bow can be out of tune, but still in time. The single cam bow can be out of tune, but never out of time.
Symantics. Better explanation though. Agreed.
 

· Registered
Joined
·
4,122 Posts
Single vs. Dual

So do single cams typically have more of a valley and better letoff than dual cams? I have two single cams (which aren't slow 318-320 IBO) and they just feel like they have more of a valley and better letoff than the binary systems I've had. They just feel more "comfortable" . Or does it really depend on each individual bow?
 

· Registered
Joined
·
1,878 Posts
The one cam bow always has more influence on nock travel because the primary force is on the bottom limb---basic physics---at the moment of release and inertia at rest-status of the limbs- the most force is on the bottom and the idler is trying to catch up through out the travel of the string forward.

So nock low drive is part of the string travel no matter how much you try to tune out that influence, the lag and reaction of the idler is a fact of physics and delivers stress's to the shaft that must be over come by counter tuning the pressures of the limbs.

This can be seen in very high speed video

A well tuned dual cam bow will have perfectly balanced string/nock travel and no vert. stress in the shaft.
 

· Registered
Joined
·
2,225 Posts
The one cam bow always has more influence on nock travel because the primary force is on the bottom limb---basic physics---at the moment of release and inertia at rest-status of the limbs- the most force is on the bottom and the idler is trying to catch up through out the travel of the string forward.

So nock low drive is part of the string travel no matter how much you try to tune out that influence, the lag and reaction of the idler is a fact of physics and delivers stress's to the shaft that must be over come by counter tuning the pressures of the limbs.

This can be seen in very high speed video

A well tuned dual cam bow will have perfectly balanced string/nock travel and no vert. stress in the shaft.
the nock travel is not determined by which limbs are loaded more than the other because (at least on todays bows) the top and bottom limbs have the same force exerted on them (sum of the forces = 0) becauce the cams are just a system of pulleys between two springs. the springs will equal out the forces even if bows are out of time or sync.

with a single cam bow the nock travel is due to the relationship of the string (1st track) to the payout track (3rd track). upon drawing the bow the payout track must let out the same amount of string as the string track. if this is not accomplished then the nock travel will be sacrificed. the reason for the payout track being closer to the axle is to influence the draw force curve on the begining of the powerstroke.

any cam system can be made to have perfect/near perfect nock travel, be it singles, duals, hybrids, binaries, or any other configuration that is approached correctly

later
jkeiffer
 
1 - 20 of 39 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top