My hammer bot.

[geeza]

A low pressure system for an axe is simpler to work out and an can be improved by increasing the flow rate at a later date as Grant pointed out. It can be done but a HP axe would require heavier valves, so in a feather would be much harder.

[wayne_trilibium]

Hi, i agree with sticking to LP. Its hard enough keeping Basher! on the ground running at 12bar and FP would be too heavy. BTW getting the rack cut in to the piston is definately the lightest way

[maddox]

Buying new LP for cheap, forget it, unless its ancient cast iron Sovjet stuff.
Ebay is one option.

Some roboteers have/had a small supply of lp stuff. But nine is really gone now? I maybe have a valve or 2 left, and a tiny piston somewere. But thats about it.

A 50*50 ram is way to small. A 50*100 is usefull.

Cutting a round rack involves a precision mill, the right cutter and a lathe to finish it off. Meaning an experienced machinist and machine shop. At this time, machine shops dont come cheap. They all have enough work.

I solved the rack for the FP heavy axe I did build by buying a mod 3 round rack and build the ram around that part.

If I would do a rebuild of a 50*100 ram I would buy a mod 2 rack and replace the original rod with that. ( mod 2 because the rod is 20mm, and that wont be to far off for a 50mm bore lp ram)

[geeza]

Im doing what Mario suggests, only MOD 1.5 ram as my seals are 16mm not 20mm, again it is a 50*100 ram.

[maddox]

16mm, strange, my 40mm ram has a rod of 16mm. I would have expected a 20mm on the 50mm bore version. But its perfectly possible that a 20 or 25mm rod is used on the next size of rams above 50mm, the 63mm bore.

But then, I dont have any problems adapting that.

[rob]

i built an axe robot out of ply wood as a template to make a stronger one at a later date and here it is

[Mouldy]

robot- looks good

mario - eds not using a normal shape piston i dont think, but why would u want to adapt it?