First build ,cat D11

[Cooper]

Ok thanks, pretty close tolerance then. One more question, I know I said 1/4 shafts for the hydraulics but after looking at it and holding it in position in model the 3/8 shafts look better. I can't really find specs for cylinders to compare 1:1 scale. I know I already made pistons and they could be used or new ones made. They are easy. Is it better to have more space in the cylinder or less? I would think less as less oil would be need for lower volume. ??? Love this forum and thanks for the help as this is new for me. I did purchase a 5 valve block and pump from premacon. Don't know how to make one of them. But once I get one then I can redneck reverse engineer it !!lol!,

[ihbuilder]

.3125" would look more prototypical but the .25" will work . what is your bore ? .375" may be to big . In theory , your only picking up the weight of the blade so your not going to need much volume .

here's a lil calculator I pulled off the net . type in your bore , PSI , and rod dia and that will give you what your cylinder can do for given amount of pressure .
http://www.baumhydraulics.com/calculators/cyl_calc.htm

[Cooper]

Originally Posted by ihbuilder

.3125" would look more prototypical but the .25" will work . what is your bore ? .375" may be to big . In theory , your only picking up the weight of the blade so your not going to need much volume .

here's a lil calculator I pulled off the net . type in your bore , PSI , and rod dia and that will give you what your cylinder can do for given amount of pressure .
http://www.baumhydraulics.com/calculators/cyl_calc.htm

Thanks, that works out well.