GMTRCPLY - GeoMeTRiCPLaY - Magnetic Sticks

 Introduction   ·   Stick Sets   ·   Steel Balls   ·   Instagram Posts 

Introduction

The classic Magnetic Stick sets come with plastic coated magnetic sticks, and ferromagnetic spheres.

Usually, the ends of each stick have opposite magnetic polarity. But there are also sets where the ends have the same magnetic polarity, and therefore contain two types of sticks.

Current "regular" sets come with short (~27mm) or long (~58-60mm) sticks. The balls have 12.0-12.8mm diameter.

The photo shows different Magnetic Sticks, from left to right...

• Generic brand, short
• Generic brand, long
• BANBBY, long
• Geomag, standard (long)
• Geomag PRO-L
• Goobi Magnetic
• Wisemag (out of production)

Magnetic Stick Sets

The table below shows the characteristics for some sets.

Brand	Type	Stick Length	Diameter	Weight	Magnetic Strngth	Ball Diameter	Weight	Notes
Generic	Short	27.1mm	6.7mm	3.9g	medium	12.0mm	7.2g
Generic	Long	58.0mm	7.0mm	6.8g	medium	12.0mm	7.2g
BANBBY	Long	58.0mm	7.0mm	6.7g	medium	12.0mm	7.2g
Geomag	Long	58.2mm	7.6mm	9.7g	high	12.8mm	8.5g
Geomag	PRO-L	58.2mm	7.4mm	9.8g	high	12.8mm	8.5g
Goobi	Long	59.9mm	9.9mm	4.1g	high	12.8mm	8.5g
Geomag	Original	27.0mm	7.4mm	4.6g	high	12.7mm	8.4g	Out of production
Wisemag	Short	30.9mm	6.4mm	5.7g	very high	12.7mm	tbd	Out of production

Steel Balls

You can combine any ferromagnetic sphere with the magnetic sticks. Below are some examples for 100Cr6 (1.3505) industrial grade steel balls that I have available.

Diameter	Volume	Weight	Density
10.00mm	0.52cm³	4.09g	7.81
10.50mm	0.61cm³	4.74g	7.83
11.00mm	0.70cm³	5.45g	7.81
13.00mm	1.15cm³	8.99g	7.81
14.00mm	1.44cm³	11.22g	7.81
15.00mm	1.77cm³	13.81g	7.81
17.00mm	2.57cm³	20.07g	7.80
19.05mm	3.62cm³	28.21g	7.79
20.00mm	4.19cm³	32.68g	7.80
22.00mm	5.58cm³	43.47g	7.80
25.40mm	8.58cm³	69.99g	8.16	possibly some other alloy
28.00mm	11.49cm³	89.73g	7.81

If you want to calculate the weight for a certain diameter, you can assume a density of about 7.8.

The 25.4mm balls I received seem to be a little different. While all other steel balls I ordered were delivered "dry", the 25.4mm balls arrived oily. Although I checked the weight in dry state, the density is higher than expected.