Making concrete or cement block machines from
If you need to make concrete blocks in far larger quantities you will need a concrete block machine. Again you can buy an expensive commercial machine which will do an excellent job for you. It will turn out enough blocks to pay for itself in time and makes the manufacturing process fairly easy. The alternative is to build your own concrete block machine. You can build a very good machine from used auto parts which will cost a fraction of the price of a commercially made machine. It will do the job just as well and you can build several for less than the cost of one purchased machine.
You can buy ready mixed concrete in bags or save money by mixing your own. Concrete is composed of sand, gravel and water mixed in the right proportions with Portland cement. Depending on the job to be done the proportions of the various components in the mix will vary. Concrete does not just dry and harden. There is actually a chemical reaction between the cement and water which causes it to harden into a crystalline mass which binds the other components together. If there is too little cement the concrete will be weak and if too much water is used it will not be good either. You need to measure the various components accurately before mixing them. A recipe for a concrete mix is given as three numbers for example 1:3:4. This means one part Portland cement mixed with three parts sand and four parts gravel. Sometimes cinders or other light 'aggregates' are used instead of gravel to make light weight blocks.
You can mix the concrete by hand on a concrete floor or plywood sheet. Do not mix it on the ground where contamination by extraneous material will result in weaker concrete. For modest amounts of concrete hand mixing is appropriate but if you are in production and need large quantities to manufacture concrete blocks or other products it is necessary to have a cement mixer or mixers to do the job. A mixer also ensures that the concrete is thoroughly mixed and even throughout.
A concrete block machine or machines will enable you to turn out hundreds or even thousands of cement blocks daily. If you are in business to supply builders or other buyers in quantity you will require machines to produce enough blocks to fill large orders. Building a machine yourself is a great way to get a low cost start when you want to move up from making blocks from hand molds. Later you may want to acquire a high production commercial machine but that is unnecessary till you need a lot more production.