That kind of stuff takes more than a $75 HF drill press that struggles with 1/2" holes.
I let a neighbor put his mule in my back pasture last summer, because the drought here made if tough to find enough to feed the beast.
Now that there has been rain, he thanked me and took the mule back to his place.
The mule ate most everything (which is good) but man, did he leave a lot of manure.
I'm hesitant to take the mower out there now...
That's a real working mule, pulls a plow and a cart. And it looks to me like the mule likes working for his boss.
Regarding the project; I think the string system solves most of the problems, but it will be difficult to get the string to extend as it wears..
Consider a longer string (and correspondingly lower rpm) than a handheld strimmer.
good approach
If it had decent reach that would be a good mower, but I don't have rear PTO.
So why do you not think the front PTO will work?
So today was cutting and fitting the pieces that make up the platform that the actuator and first stage of the boom will be mounted on: (All 1/4" steel, not going to worry about this lasting. Worst case I can transform this into a winch platform.
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That is sort of why I'm leaning towards using something like these on the cutting head. Even if I have to change them each time I mow (4 - 5 times a year) that wouldn't be prohibitively expensive. Then I don't have to "bump" it to get line to extend.
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I have used that style head on my string trimmer for a few years now. It works ok if your not hitting things like rocks, chain link, saplings trees, concrete and exposed rebar.
The center actually fell out of the first one.
The biggest problem I have with them is the mounting. But that may just be the trimmer.