Lima Replacement Motor Adaptor: Finding the Perfect Fit!

Another short video relating to our Lima motor conversion kits.

Today we’re having a look at two alternative techniques for improving the fit between our ringfield motor adaptors and the CD drive motors that go in them.

Normally, the motor will fit into the adaptor with a good interference fit and will sit snugly, but sometimes manufacturing tolerances mean there may be a little play.

The two featured options resolve that issue for good, and take only seconds to do:

    • 01:01 – Method 1 (Permanent)
    • 03:01 – Method 2 (Reversible – Preferred Option)

You can grab yourself a roll of 8mm Kapton tape here (affiliate link):

To get yourself a conversion kit for your own Lima loco, head to:

This is a follow on video that supplements our previous video on upgrading a Lima ringfield motor to a CD-style motor, using our special 3D-printed conversion kits.

You can watch that earlier video here:

For full step-by-step instructions, please visit:

#RingfieldReplacement #Lima #Hornby

Ringfield Motor Upgrade Using a 3D Printed Adaptor

In this video, we take a look at an alternative method for replacing the ringfield/pancake motor in older Lima and Hornby models with a brand new CD/DVD drive motor.

We’ve used glue and brass tube in earlier projects to support the new motor, and while it works well, it can be a fiddly process, it takes time and can be hard to reverse.

Using a computer-designed and 3D-printed adaptor, you can quickly and simply install and perfectly align a replacement DC motor.

If you ever needed to replace a component, or indeed wanted to reinstall the original ringfield motor, it’s entirely possible to do so. This is a non-invasive alternative!

This is a detailed, step-by-step video and you’ll probably want a cup of tea or coffee and a comfy chair. The methods used in this video are not necessarily the only way to do it, nor necessarily the best.

Some things to consider

The 10mm CD/DVD drive motor should work in most Lima models locomotives of the following OO gauge classes: 08, 09, 31, 37, 40, 47, 52, 59, 60, 66 and 92. Other models may be able to accommodate a 12mm motor, but you must check dimensions yourself first and the 3D printed part would have to be altered accordingly.

The replacement motor is a 12000rpm, 6V, 0.03A DC motor. The output from a DCC decoder or a DC controller can reach 12V DC (sometimes a little higher) at the top end. In order to avoid motor burn-out and prolong motor life:

1. Diodes should be used to reduce voltage (as shown in the video),
2. DCC decoders should have their CV5 value reduced (if available), and
3. Top speeds should be kept to a minimum and run at higher speeds for short periods only.

The PLA+ plastic filament used in the production of the adaptor has a glass transition temperature of 50°-60°C (the point at which it may begin to soften). Our trials showed the motor got up to about 47.6°C after an hour of constant running at medium-to-fast speeds.

Under normal ‘home’ use, it’s unlikely that the plastic will be adversely affected by motor temperature, however if the motor is used for very long periods or worked hard with a long rake etc., its temperature may begin to exceed the glass transition temperature of the plastic and it may begin to soften.

Please note: I’ve drawn upon ideas and suggestions from a range of sources, as well as implementing my own. If you choose to follow any of the steps outlined in this article or video, you do so at your own risk and any damage to yourself, your models or your equipment is your own responsibility.