No Near Death Draining Required - this is Business.
Ask the Blood Donation Clinic near you.
Thirteen humans at a time (the max amount) are placed inside this machine and hooked up to it through a series of tubes and wires. They are periodically drained to the maximum that their bodies can take, being kept alive by artificial processes.
Very bad idea. First off, it's just not necessary. You can use a hundred people or a thousand and there's no reason to get all the blood at the same time !
Blood is stored and used quite normally by hospitals and can be kept for period of longer than a month when cooled.
When donating blood typically the amount varies from place to place, but would typically not be much more than 500 mL (about a pint for you people still stuck with the backward Imperial system :-) ). No need to kill the donor.
This provides up to 50 pints in total
So 50 people required for your system.
Blood donors should have replaced the lost blood completely within two months and you can base your requirements on that level of safe production.
This also places some limits on what's practical in terms of nearly draining the life out of people. The more you take the longer (and harder) it is for the body to replace the lost blood. The more you take the more vulnerable the "donor" is to disease and medical complications.
In the US about 43,000 pints of donated blood are used every day (more always needed, BTW :-) ). That's a potential production rate (without much difficulty) of 860 new golems per day for you and not a single human had to be killed !
Now you can probably do better (see below) that this rate of production without any problems, but even with that rate you have an army of over 300,000 golems in just one year. The US army is about 2.5 million active enlisted and 3.5 million reserve.
And this thing can Pay For Itself !
My plan is to produce a large number of them to include in my army for world conquest.
There's not even a need to force people to do this. If you're producing golems you are producing workers. OK, eventually you're going to use them to take over the world, but this is one case where it doesn't pay to advertise !
What you do is start a business paying people for normal blood donations (maybe even supplying hospitals for free for PR purposes) and funding this by renting out golems for all those tasks it's illegal to use child labor or slaves for. These golems are expendable anyway, so hey, the odd death isn't a big problem for anyone.
People will happily donate blood as normal (if not more) when being paid for it and there's no need for chains or kidnappings or enslavement. No fuss, no suspicious government investigations.
Heck, the military would actually welcome golems for hire. You might even get the idiots in the military to train your golems for you this way !
The possibilities are endless.
You're aiming at about 6 million golems to defeat any army on Earth (do these things need weapons ?). Well if you get the entire world donating blood at normal levels, and extrapolating from US population levels, you could get something like 20,000 golems a day ! That's an army of 7.3 million in a year !
Heck, why take over the world with an army at all ? This has the potential for a real money earner.
Problems of Management ...
After you made the first year's batch of golems you have a private workforce of 7.3 million golems.
And just what do these things eat ? Do they need housing ? Do they require medical care ? Education ? Training ?
Renting them to the US military sounds attractive. Those suckers in the Pentagon will pay for all that stuff, train them, teach them to follow orders and pay you for this !
Man, don't ya love the military-industrial complex ! :-)
But if they don't (bribe here, donation there) then you need to use the golem army to work for a living until you've enough resources to launch your attack.
Of you could just issue shares and make even more money that way !
But if you insist on ruining a good money making scheme, then right up until it's too late to stop you, you are the smiling face of Golem and Blood Inc. (OK, the name needs work :-) ).