Replacement 3pi Ball Caster with 1/2" Plastic Ball

SKU: POLOLU-957 Brand: Pololu

Retired Product

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This product has been retired. It is no longer available, but this page has been kept for reference.

This ball caster was originally released as a replacement part for the 3pi robot, but the 1/2" ball can also be used a replacement part for the newer 3pi+ robot, which has the housing for the ball built directly into the chassis. This ball caster can also be used as a general-purpose ball caster: when mounted through a hole in a chassis that uses Pololu's micro metal gearmotors and Pololu's 32×7mm wheels, as on the 3pi, this ball caster is just the right height to keep the chassis level. The hole for this ball caster in the 3pi chassis has a diameter of 600 mils (0.6") and has a side that is flattened by 30 mils (0.03").

Replacing the 3pi Ball Caster

To replace the ball caster on your original 3pi, you will need to unscrew the rear battery holder (pull off the LCD and remove the batteries to access the screw) and gently bend the holder far enough out of the way to pull out the existing ball caster and slip in the new one. The battery holder is soldered to the 3pi PCB chassis on one side, so you will not be able to fully remove the battery holder. Take care not to lose the plastic spacer that is underneath the holder.

To replace the ball on your 3pi+ robot, simply pop the existing one out of the socket on the chassis and pop the ball included with this product in instead.

Note: This ball caster does not have mounting holes and includes no mounting hardware or spacers.

People often buy this product together with:

Pololu Ball Caster with 3/8" Plastic Ball

QTR-8A Reflectance Sensor Array

Pololu Micro Metal Gearmotor Bracket Pair - Black

Dimensions

Ball diameter:	0.5 in
Weight:	2 g

General specifications

Ball material:	plastic

File downloads

Dimension diagram of the Replacement 3pi Ball Caster with 1/2" Plastic Ball (166k pdf)
3D model of the Replacement 3pi Ball Caster with 1/2" Plastic Ball (2MB step)

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Retired

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Products that weigh more than 0.5 KG may cost more than what's shown (for example, test equipment, machines, >500mL liquids, etc).

We deliver Australia-wide with these options (depends on the final destination - you can get a quote on the view cart page):

$3+ for Stamped Mail (typically 10+ business days, not tracked, only available on selected small items)
$6+ for Standard Post (typically 6+ business days, tracked)
$10+ for Express Post (typically 2+ business days, tracked)
Pickup - Free! Only available to customers who live in the Newcastle region (must order online and only pickup after we email to notify you the order is ready). Orders placed after 2PM may not be ready until the following business day.

Non-metro addresses in WA, NT, SA & TAS can take 2+ days in addition to the above information.

Some batteries (such as LiPo) can't be shipped by Air. During checkout, Express Post and International Methods will not be an option if you have that type of battery in your shopping cart.

International Orders - the following rates are for New Zealand and will vary for other countries:

$11+ for Pack and Track (3+ days, tracked)
$16+ for Express International (2-5 days, tracked)

If you order lots of gear, the postage amount will increase based on the weight of your order.

Our physical address (here's a PDF which includes other key business details):

Unit 18, 132 Garden Grove Parade
Adamstown
NSW, 2289
Australia

Take a look at our customer service page if you have other questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.

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