The Home Machinist!

Ok that makes sense, thank you! No progress today, in fact I woke up in the middle of the night to searing left abdominal pain and had to go to the ER....Kidney Stone! I'm waiting for this sucker to come out, and in the meantime I'm on pain meds and flow-something but I'm throwing up nearly everythi...

Ahh, I was wondering why you didn't use dynamics pump. Makes sense. The aluminum body would grow with heat and have more "blow by". Also, good call on the "open diff" slippage with the parallel pumps, I didn't think about that. I'd say to be on the safe side I'll need about a 20-...

The Dynamic BMPH50 looks like it's more efficient and makes more torque but it's a touch slower at the same GPM. Adding an extra tooth to the output shaft sprocket would make it about equal in RPM at the wheels though to the Prince motor.

Found the Dynamic motor info.

http://www.dynamicfc.com/documents/2016 ... s_BMPH.pdf

Looks like the equal would be a BMPH50. No mention of side loads on the output shaft on this one. ????

Dinosaur, initially I was trying to calculate the effective drive ratio based on the CI/rev, but was finding variances in the math as far as cubic inches @ RPM and the conversion to GPM. Looking over what you've posted, we've gotten to the same place just different ways. I would say it's due to decr...

The speed range should be 1mph at idle to 5mph at 3000 RPM. My engine has been modified and the governor removed, and some pumps can be ran up to 4000 rpm continuous, so there is an option for more speed via more engine RPM for short intervals. I raced this engine for 2 years and geared for a peak R...

I think I am making some sense of the hydraulic pump and motors sizing. I've found the CMM50 series motors offered by Prince, they are reversible instantly by reversing fluid flow, and this model has an 800 RPM rated max continuous. Flow chart info varies from 113 rpm at 2GPM to 578 rpm at 8 gpm. Wi...

I know you guys would like some pics. I'm having a terrible time with Photobucket. It's so riddled with ads and both at work and at home I'm on a wireless router and it's almost unusable. I don't know if it's due to adblocker fighting the ads or the fact that so many of the ads have little clips of ...

Lots of parts arrived yesterday. My 25' box of chain, 30T sprockets( I'm using Honda CMX-250 rear sprockets), the air cylinders, and rivets for the aluminum body. I grabbed my 2 sheets of .080 aluminum sheet from storage, and bought some 1/2 and 3/4 aluminum angle from the remnant shelf at another s...

I'll look into it for sure, thanks for the tip.

I'm thinking of naming my RR the "PG & F". Pallet-wood, Garbage, and Firewood Haha.

Glen, feel free to visit your local laser cutter. Ours has been a valuable resource for free lumber. The sheets of metal they receive come on nice big pallets with 4x4's and/or 2x6's in the 8' to 12' long range. It's pallet grade stuff for sure, but its great for a trestle. Our local cutter was stac...