advice design construction rake for mini excavator

Small and old is not a helpful description. Look at the bucket you have, measure the length the teeth stick out from the blade portion of the bucket. Measure the width and thickness of the blade material. say the teeth are 25mm x 20mm, and protrude 75mm from the blade portion of the bucket. The blade of the bucket is 15mm thick and 40mm wide.
What you want to do is keep the ratio of the crossections the same. so to double the length of the teeth, they have a section of 25 x 20mm = 5.0CM2, so you need about 10CM2 at the end where it connects to the section that acts like the blade area of the bucket. so the section would be like 35mm x 28mm=9.8CM2.

This is rough and dirty way to figure out how to upsize something. The best way is to find one that fits your size machine and measure. If you have any rocky ground, BEWARE, you will tear up anything, that is not strong enough to stall the hydraulics.

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I work at a U.S. Equipment Attachment Manufacturer that will remain nameless as Forums do not and should not be commercials. For Land Clearing applications as in most cases the right tool for the job makes your day a lot easier.
To the point; we see the trend for land clearing with Excavators to certainly equip the machine with a coupler. The icing on the cake is to also equip the machine with a Thumb. The Thumb should be designed to stay on the machine when you uncouple (We are careful not to say &#;drop&#;) an attachment. The coupler then allows you to swap from the bucket for digging out a rock or stump to then change to the rake for sorting debris from the soil for loading trucks or grinders. The Combination of the Thumb and the Rake actually provides a &#;grapple&#; type attachment for in most cases less $$ than buying a grapple.
We see in the States a real variation in regions and their preferences on the types of thumbs and if contractors even use thumbs. Any type of thumb is better than no thumb and it is almost humorous to watch operators do a balancing act with their machine to load material with no thumb when they could have loaded the same in seconds if they could get a grip on their material. If the bulk of your work is above ground and involves material other than dirt consider the Bucket, Coupler, Thumb, Rake combination. No the arrangement is not cheap but neither is your time and fuel.
Hint, Buy your combination attachment package from the same manufacturer so all products fit each other and there is one source of responsibility if there is any issues.
Have a great day all and try not to break anything.

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