Mindsets In-line 1.5-3V Motor Gearbox Kit

Price match guranteePrice match guarantee

We can price match this item if found elsewhere. Call us on:

0333 400 9500

Quoting product code: N99QN


Our delivery options

Free standard delivery (orders over £10)
3-5 working days 9am-5pm
Standard delivery (orders under £10)
3-5 working days 9am-5pm
Next day delivery
Mon - Fri, order by 6pm
From £5.99
Specific day/time delivery
Choose am / pm OR before 9am / 10.30am
From £5.99

Specific options for this product are available in the checkout. Read more delivery information

About this product


  • Six piece kit with motor
  • Great for use in models, robots, experiments and education
  • Operating voltage between 1.5V and 3V

Product overview

• Six piece kit with motor
• Great for use in models, robots, experiments and education
• Operating voltage between 1.5V and 3V
• Multiple different ratios to choose from
• Speeds of up to 60 rotations per minute

What comes in this kit?
Build your own gearbox with four gears, motor and battery box included. Perfect for a wide range of models and experiments - anything from a car to a windmill - as well as demonstrating how different gears can affect the system’s output. Use a single gear or multiple gears to get the ideal ratio. The wires can be twisted around the motor or soldered more securely in place.

What motor does this use?
The motor turns approximately once per second and runs off 1.5-3V. It comes with a battery box that can hold two AA batteries (sold separately, Order Code L43AL). The gears are designed to fit onto the motor shaft except for the pinion which will fit onto a 2mm shaft.


Motor part code MM28
Supply voltage DC 1.5 V – 3 V
Speed at max efficiency 60 rpm @ 3V
Current at max efficiency 1.28 A @ 6 V
Output power at max efficiency 4 W @ 6 V
Shaft diameter 3.2 mm
Dimensions 22.4 mm x 22.4 mm ( 30.2 including shaft) x 70.2 mm
Type Pinon
ID 2 mm
OD 15 mm
Number of teeth 12
Type Small gear
ID Shaped for motor gearbox
OD 22 mm
Number of teeth 20
Type Medium gear
ID Shaped for motor gearbox
OD 32 mm
Number of teeth 30
Type Large gear
ID Shaped for motor gearbox
OD 40 mm
Number of teeth 40

What is the reduction ratio of the gearbox?

Asked by: Andrew
I can confirm that the gear ratio of the gearbox used is 120:1.
Answered by: darren cordon
Date published: 2017-03-23

I have bought this kit and when connecting the two little wires to the metal parts they easily come undone.. does this need to be soldered on? 

Asked by: Suzanne
Yes they should be soldered on
Answered by: Billy
Date published: 2017-03-09

The battery box dimensions were given in a previous question, but only 2 dimensions. What are the full dimensions of the battery box?

Asked by: Andrew
The full dimensions of the battery box are: 70 x 35 x 20 (mm) with an extra 3mm clearance required for the switch.
Answered by: Les
Date published: 2016-11-22

Hi. Referring to the picture, are the 4 yellow gears located inside the white casing or are they to be mounted externally. Also, do you have the pitch circle diameter of these gears? Thank you.

Asked by: ans6574
This service is for frequently asked questions and does not allow two way communication, In order for us to best assist you with your technical issue please contact us on the details below : 0333 400 9500 or email technical@maplin.co.uk
Answered by: Darren
Date published: 2016-11-08

Hello, please can you tell me the lowest RPM this will do.

Asked by: tony
This would be approx 30 rpm at 1.5V which is as low as it will reliably operate.
Answered by: Russell
Date published: 2016-02-19

I'm pushed for space in a model traction engine.  What size (diam.) are the motor, gears, shafts and battery box ?

Asked by: Mike
The motor is 28mm X 71mm. The battery box is 68.5mmX38.5mm. The biggest cog is 40.8mm diameter & 18.1mm wide
Answered by: Dominic
Date published: 2015-08-18

Can you tell me the dimensions of the gear unit? Preferably from the end of the output shaft to the back of the casing? Thanks

Asked by: Dave
Shaft to back of casing is 30mm.
Answered by: Russell
Date published: 2015-07-28
  • y_2018, m_2, d_23, h_9CST
  • bvseo_bulk, prod_bvqa, vn_bulk_2.0.7
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_7
  • loc_en_GB, sid_N99QN, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_maplin-en_gb