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Old 06-28-2008, 10:45 AM
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1 or 2 linear actuators

I want to use a linear actuator(s) to open the trunk lid on my 36 Buick 2dr coupe. Can't see a way to mount one in the middle without it looking weird. I'm concerned it I put one on one side only that the lid will sit crooked when down. If I use 2 would I run into problems with uneven pull or one pulling down faster than the other. Anyone have experience doing it either way? What's best?

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Old 06-28-2008, 10:56 AM
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You are correct to be concerned. It is difficult to synchronize two linear actuators unless they are very high precision units. One actuator will easily open and close your trunk lid if sized properly.

I'm going to move this thread to General Rodding Tech, but also leave it in Interior.

Dan
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Old 06-28-2008, 11:55 AM
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Thanks Dan. Thats what I was scared of. But with 1 actuator whould the trunk lid not sit higher on the side that doesn't have one. It seems to me the weather strip would hold the non actuated side higher? Unless of coarse you mounted it in the middle?
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Old 06-28-2008, 12:15 PM
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How stiff is the trunk lid..?? if it is stiff then it should not make a difference in the mounting of the actuator. does the trunk lid close straight now??

Sam
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Old 06-28-2008, 01:00 PM
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Dakota Digital sells "Dual Linear Motor Controller with Safety Reverse". This controls 2 linear actuators at same time. This should fix your problem. http://www.dakotadigital.com/. Look under Automotive Accesories, Linear Actuators and Controllers.

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Old 06-28-2008, 01:50 PM
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Sometimes you want to give yourself a slap across the back of the head. I was reading OneMoreTime's response and it dawned on me. Why not just put the weather seal in and push down where the actuator would we pulling and see what happens. Sometimes someone asking a question gives you the obvious answer. Thanks Dan and OneMoreTime.
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Old 06-28-2008, 01:52 PM
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That controller is a great solution if he really needs two actuators. I used to sell precision linear actuators and ballscrews in another life. At that time, there weren't any inexpensive controllers for dual actuators.
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Old 06-29-2008, 10:36 AM
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I'm sure he can get away with using 1 linear actuator and it will raise this heavy trunk. The problem is these were never made to be lifted from one side and on a trunk this heavy . The stress it puts on the mounting hinge area of the trunk is the problem over time. That is why you only see these offered for one side on small, light trunks such as 34 Fords. If I used only 1 actuator then I would reinforce metal area where the brackets mount. Look at the metal where these brackets mount and you will see why.

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Old 07-08-2008, 09:19 PM
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Linear actuators are great as a single unit but even with a controller, one will work faster than the other. It's just the nature of any motor driven device outside of a Servo motor & drive which is very expensive.
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Old 07-08-2008, 10:00 PM
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Take a look at some of the new SUVs with tail gate lifts. My daughter has a GMC Acadia that has a single actuator that opens and closes the hatch. I am sure that big hatch weighs more than your trunk. You may have to rework the hinges.

Pat
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Old 07-09-2008, 12:05 AM
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Quote:
Originally Posted by S10 Racer
Linear actuators are great as a single unit but even with a controller, one will work faster than the other. It's just the nature of any motor driven device outside of a Servo motor & drive which is very expensive.
A linear actuator is a combination of a motor, a gearbox and either a ballscrew or an acme screw. (An acme screw operates metal to metal, and a ballscrew has ball bearings in between the ballnut and the screw) The cheaper ones use acme screws, which are extremely inefficient when compared to a ballscrew. You are right that two motors would not run exactly the same, even with the controller. The other limiting factors are the precision of the ballscrew and the quality of the gears in the gearbox. If all three of the components of the two linear actuators are less than identical to each other, the more trouble there would be synchronizing them.

A single linear actuator can be extremely powerful. The greater the gear ratio of the gearbox and the more threads per inch the screw has determines how powerful, size for size, the unit is. That would also make the unit operate more slowly, which may not be all that desirable. (You wouldn't want to wait 5 minutes for your trunk lid to open.) Couple that with permanent magnet DC motors which are constant torque devices at rated voltage regardless of speed, and the unit can more than handle almost any load.
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Old 07-09-2008, 08:20 AM
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Quote:
Originally Posted by S10 Racer
Linear actuators are great as a single unit but even with a controller, one will work faster than the other. It's just the nature of any motor driven device outside of a Servo motor & drive which is very expensive.
As motioned the precision linear actuators, the ones with position feedback capability can operate exactly alike. Of course they are controlled by a computer of programmable controller (PLC).

Vince
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Old 07-09-2008, 11:28 AM
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Quote:
Originally Posted by 302 Z28
As motioned the precision linear actuators, the ones with position feedback capability can operate exactly alike. Of course they are controlled by a computer of programmable controller (PLC).

Vince
The precision actuators usually are operated with servo motors and servo controllers. A good example of precision actuators working in tandem is the unloading ramps at airports that are raised and lowered and extended and retracted by linear actuators to reach an airplane door.
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Old 07-10-2008, 08:14 AM
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Thanks to everyone. I went with a single actuator that I got from SURPLUS CENTER. It's a 10" 107LB. model. It is not hidden but goes from the floor to where the trunk hinge mounts on the lid. I think with this setup I avoid the stresses Old Relic was referring to. It seems to work great.
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Old 07-24-2008, 08:20 AM
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Just thought i'd post some pics of the actuator installed. What do you think? The floor of the trunk is 16 ga sheet metal with 1/2" plywood on top to stiffen and sound deaden it. be brutal if you think it's ugly.
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