Ryobi 40v Robot Mower With 40v Trimmer Whiskers By Jstarne1/ Starnes

I realized the batteries that come with the weed trimmers are the "slim" batteries which are 1 ah @40v, These will be fine for testing during the build, but horrible for actual use. So instead I am going to search for the 5 AH version for a cheaper price on ebay but if I cannot get one for less than 60 or 70 I will just buy it new because they come with a automatic 5 yr warranty against charge fade from Ryobi and Home Depot.

I cant afford to buy a couple now but maybe next month after the bills are clear. I probably wont be ready for actual usage by then so that's OK.

Hey Dave , I would love to get some from you. That's a good price and would help the project.

Cool, just let me know how many you want. I just checked and I have only four available. Thought I had more. Please contact me off the forum at dschulpius at gmail dot com and we'll work out the details. Thanks!

Servo City order, I plan to use sprockets and chain to transfer torque from the drill gearbox to the hub of the rear drive wheels. They are good for 55 pound working load in either direction according to servo city. I chose these over the metal because they are easier to adjust and disassemble and this robot will only weight 60-80 pounds.

2 (RHS-250-16) 16 Tooth Hub Mount $5.64 $11.28 Sprocket (.250 inch) * Weight: 0.01 lbs. each

2 (RHS-250-48) 48 Tooth Hub Mount $8.20 $16.40 Sprocket (.250 inch) * Weight: 0.01 lbs. each

6 (615150) 0.250 inch Plastic Chain (48 $6.99 $41.94 Links/package) * Weight: 0.02 lbs. each

My order is on the way and will be received in 3-4 days by USPS

I love Servocity! They have such cool and imaginative stuff.

Yes they are a great supplier! They are not cheap but are not out of this world on pricing either. They have a happy medium.

I think I have bought 4 gearboxes from them and other misc stuff that was useful.

OK I already have some 15 x 6 in Arnold Turf saver lawn tires but I am concerned they are too big to fit. So I took advantage of a sale at Harbor freight and picked up 13 in x 5 Haulmaster tires. I got them for 12.99 and an additional 20 percent off with a coupon. If they fit the mower well then I will drill holes and put on some kind of home made adapter to mount the chain sprocket to.

I have 4 of these Arnold tires. They have the same tread pattern but the tread is deeper and this wheel is 1 inch wider that the cheaper wheel. Also the Arnold ( Carlisle rubber) is a smooth grease bearing only which is messy. The Haulmaster has a cheap ball bearing, but ball bearing non the less so I wont need to lube it.

Though the Arnold certainly would offer a bit more grip I am leaning towards the smaller wheel. Any input guys? thanks

Good luck with your lawn mower project. I built an EZBv4 version about a year ago. synthiam.com/Community/Questions/8102

For safety reasons I chose to use trimmer heads rather than a steel blade. Chain and sprockets work well, but tend to get clogged with grass clippings. Instead I opted for sealed planetary transmissions. I've since upgraded mine to four wheel drive with 8" diameter pneumatic tires for better performance. I have some other improvements planned when I can find the time. I'll be following your progress.

Jim