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Chatelot16:
You wrote:
I really do not see the usefulness of hydraulic advance, except to increase the price and lose power: a fixed transmission ratio between the knives and the drive always makes the insert same thickness: a belt with declutching by tensioning the belt will be enough for me.
A few remarks justifying the use of hydraulics: It all depends on the size of the wood you want to grind, but as soon as the diameter is a little substantial the feed rollers are very busy.
If we want a regular product, we need a good dimensioning of the power of the feeder (which does not always guarantee the hydraulics, because on certain "cheap" constructions, the motors are undersized).
I am not sure that belt drive is possible for 2 reasons:
1- Difficult to consider anything other than small diameter driven pulleys since the rollers are limited in diameter, therefore low power transmitted.
2- Difficult to imagine a consequent power transfer in a device to be disengaged frequently, and this, by tensioning belts.
As rightly evokes
Did67, the hydraulic (or often electro-hydraulic) declutching system operates with a small amplitude of the control rod and a high sensitivity, which will be harder to obtain from a mechanical device.
Finally, last point, the hydraulics allow reverse gear, essential in the event of jamming (rather concerns small diameters) or exceeding the maximum caliber (feet of rods close to the maximum).
Anyway, your project is interesting and if you want to exchange on the forum or by MP, no problem!
