DIY, how to build your own cantilever sliding gate (7) – Install the gate opener

There is a wide selection of gate opener products available online or at local shop, The price would range from several hundred dollars to more than a grand. It is really hard to tell the difference by the appearance. After intensive research on reviews, I decided to purchase the ALEKO AR1450 sliding gate opener with gear rack.

AR1450, courtesy of ALEKO product.
AR1450, courtesy of ALEKO product.

It comes with the kits that meet all my basic needs in my plan:

  • Gate opener.
  • Two (2) remotes.
  • Mounting bracket.
  • Anchor bolts.
  • Screws and nuts.
  • Gear lock/unlock key.
  • 20 ft (3.3 ft x 5 pcs) linear gear rack.

Other specs all look fine to me:

  • Opens gates weighing up to 1600 lbs. — Mine won’t be more than 300 lbs.
  • Opens gates up to 55 ft. in length. — Mine is about 12 ft in length.
  • Soft starting / stopping
Gear-driven vs chain-driven

Chain-driven is the most common way to drive a sliding gate, it’s relatively cheaper and easier to install. However, gear-driven mechanism produces quieter and smoother transition. Plus, the linear gear rack looks more attractive than the sagging chain.

Chain-driven vs. gear-driven.
Chain-driven vs. gear-driven.
Receiving the packages

The first impression upon receiving the packages were heavy, both for the AR1450 opener and the nylon gear racks!

Two boxes: one for the opener; another for the gear racks
Two boxes: one for the opener; another for the gear racks

Don’t worry if you couldn’t find the remotes, they were actually hiding inside the opener’s plastic cover. Removing the plastic cover will expose the key components: the giant motor taking most of the space, the circuit board leaning against the motor, magnetic sensor and capacitor. It is not necessary to understand what they are. All you need to do is to wire your power cord to the connector shown in the photo below.

Wire your power cord to the connect in circle. All the rest of the system is pre-wired out of package.
Wire your power cord to the connector in circle. The rest of the system is pre-configured by manufacturer.

As soon as you get power cords connected correctly, the indicator on the circuit board will light up, and you can immediately control your opener with the provided remote! For tweaks like changing open/close direction, increasing/decreasing force or enabling pedestrian mode, you will need to dig a little deeper into the manual. Other than those, the gate opener almost requires zero effort on the electrical setup. Most of my work, however, was spent on the masonry work — taking measures, assembling mold and pouring concrete for the opener’s base.

Assemble the mounting base and concrete mold

It took me quite sometime to figure out how to assemble the metal mounting base for the gate opener as the manual didn’t seem to be very helpful on this topic. The assembled mounting base looks like a mini oil rig: four anchors shown as below were to be buried in the concrete pouring to produce strong clamping force. Another set of bolts that go straight up are for the gate opener.

Mounting base assembly with anchor bolts
Mounting bracket assembly with anchor bolts

If you recall my last post about trenching, you’d probably have noticed that I dug a pretty big hole where the PVC pipe terminated. That hole was actually prepared for the gate opener. A rock solid base made by concrete is very important for the gate opener to provide enough force to move the gate. The hole was about 2 ft wide by 2 ft long, 1.5 ft deep. Since the gate opener was measured to be installed at 8″ above the ground, I made a mold of the same height with width / length at about 1′ / 1’4″. Mold was then installed on the site with proper bracing and supporting to receive concrete.

1. A mold to lift the gate opener 8
1. A mold to lift the gate opener 8″ above the ground; 2. The mounting base will be installed on top of the concrete; 3: Mold was setup on site; 4. Conduit was extended above the mold.

After I acquired a cement mixer (shown below), my concrete pouring work became so much fun! Before that, I was basically mixing it with shovels….worked fine but not easy. I depleted fours bags of 60 lbs concrete mix to fill up the mold for the gate opener base pad. So total 240 lbs, Heavy!!! Considering the force the motor is going to push on the gate, the heavier base really pays off.

Cement mixer I purchased from craiglist.
Cement mixer I purchased on craigslist.
Concrete mix is still wet. Note the mounting bracket is placed on top of the mix with the four anchor bolts buried inside.
Concrete mix is still wet. Note the mounting base is placed on top of the mix with its four anchor bolts being buried inside the mix.
Concrete mix started curling in the following hours. Wait at least one day before removing the molds.
Concrete mix started curling in the following hours. Wait at least 24 hours before removing the molds.

After I removed the mold, I painted the concrete base with wall sealer. Totally unnecessary, but I just happen to have it around. So why not?

Paint wall sealer onto the curled concrete base.
Paint wall sealer onto the curled concrete pad.

Now the concrete pad is ready to receive the gate opener. Make sure the opener is not too far nor too close to the gate frame. Measure the distance by roughly placing a nylon gear rack on the gate. When you are happy with the position, lock the opener with nuts provided. Make sure the opener is tightly secured on the mounting base.

Install the gate opener and adjust the position.
Install the gate opener and adjust the position.
Mounting the gear racks

If my gate were composed of square metal tubes, it would be fairly easy to mount the gear racks — just to place the racks flush against the frame and use self-tapping metal screws to fasten them. However, circular pipes like mine doesn’t provide any flat surface to be flush against. I would have to “create” some.

Looking back into the gate opener kits, I noticed one type of parts that I never realized what to do with before. The small metal bracket shown in the photo below is actually a piece of perfect gadget to “create” such flat surface for the purpose of mounting the gear racks on round pipes.

Bracket for mounting gear rack on round pipes.
Bracket for mounting gear rack on round pipes.

In order to “create” such flat surface, I would need to weld this bracket on to the pipe. Since I welded the whole gate frame together, this small task wound’t be a challenge for me any more.

Use a piece of scrap wood/metal as alignment.
Use a piece of scrap wood/metal as alignment.
Welding a
Welding a “L” shape bracket on to round pipe to create flat surface for the purpose of mounting gear rack.

I still don’t know if I am making correct use of those brackets, but they do look perfect for this purpose. The bracket has a open slot in the middle, so I could easily adjust the height of the gear rack. Here is the final assembly of the gear racks on those brackets, and I connected four racks together to make a 12-foot long continuous gear rack.

Long continuous gear rack made by four pieces connected together.
Long continuous gear rack made by four pieces that are connected together.
Magnetic Limit

This ALEKO AR1450 gate opener relies on magnetic limit to control the stop of the gate. Basically the magnetic limit is mounted on the gear rack, when the sensor inside the opener senses the passing magnet, it will trigger the stop operation of the motor. Two sets of magnet / brackets are provided in the kits: a taller one for gate open limit; a shorter one for close limit.

Magnet is approaching, the gate is about to stop.
Magnet limit is approaching, the gate is about to stop.

Note that the gate won’t stop immediately when it sense the magnet, the control circuit inside the opener will ramp down the rotation of the motor. When choosing the location for the magnet limits, make sure leave some buffering distance before the gate completely stops. This is very good design of the gate opener to have the ramp up / ramp down mechanism. Without it, the abrupt start or stop will result in tremendous momentum on the gate frame, gate opener and posts, just like the gate is actually crashing on the gate opener every time it starts for stops moving. Frequent crashes day after day like this will eventually break the gate and the opener.

[Edited on Mar 28th, 2016]

In case you would like to know more details about wiring the AR1450 mother board, please refer to the following image that came with the product.

Detail wiring diagram of AR1450 gate opener mother board.
Detail wiring diagram of AR1450 gate opener mother board.
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10 thoughts on “DIY, how to build your own cantilever sliding gate (7) – Install the gate opener

  1. Can you provide the diameter and RPM of the openers drive gear? Can the gear be easily removed and swapped out for a chain sprocket? If you can determine, what is the output shaft diameter? I want to use the same gate opener to open a roof for an astronomical observatory.

  2. Could you add more detail on the wiring onto the control board and where the black and red wire connects to

    1. I didn’t touch that part as they came pre-wired out of the box. If you woud like to know what they are, please refer to the image I just uploaded towards the bottom of the the post.

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