A typical 1/2"x 6" aluminum, 180:1 gear with a 2" bore next to a 12"x 1", HDPE, 360:1 gear with a 3" bore. A typical 1/2" x 12" gear anodized blue is on the right. 

Details and pricing below. 

Link To More Pictures of Our Gears
Link to the PE testing results

Teeth	Size	1/2" thick Aluminum	1" thick Aluminum	1" thick HDPE
144	4"	$200	$220	$165
180	6"	$235	$265	$165
240	8"	$290	$390	$165
270	9"	$310	$410	$165
360	12"	$350	$435	$185
405	13"	$385	$485	$246
480	16"	$425	$525	$246

• 1/2" thick Al. gears come with an oxide coated 1" long x 1/2" OD x 1/4" ID worm. N/C
• 1" thick HDPE gears come with an oxide coated  1.5" long x  1"OD x  5/8" ID worm. N/C
• Worm shafts can be up to 14" long, extra charges apply. 
• Anodizing is available for $100 per order. 
• Gear/worm bore is custom & free. Specify at ordering time. 
• Slip clutches for gears are available. Specify desired material and diameter. Sample page for the clutch plates is here
• Geartrains with reduction gearing are available. See the machining page for examples.
• Other materials and thicknesses, including gear bronze and 7075 aluminum, are available. Added material charges may apply. 
• Different TPI can be ordered if needed. Added charges will apply.
• All gears are hobbed using a custom made hob. 
• Periodic error has a guarantee that is as follows: PE has been tested by us with a CCD camera, using our mount, worm mounting, electronics and software. P.E. was found to be a maximum of  3 arc seconds at 1816" Fl, easily correctable with most P.E. correction routines available. 
• There are many user controlled variables that can effect P.E. that we have no control over. We cannot guarantee your results. We do state, as above, that using our mount, worm mount, electronics and software, that we are able to achieve very acceptable PE results using a CCD camera. 
• Visual PE is not apparent even at high magnification using our mount, gears, worm mounting, electronics and software. 
• Star testing on a GEM with a video sample and specs will be available soon. 
• The Al. face finish is to 600 grit and is mirror like, ready for anodizing.
• Turn time is order specific unless stock items are acceptable. Please Contact us for a quote and time frame. Parts orders are usually done inside of a week. Modification to stock items is completed within hours.