Frequently Asked Questions
What are the SHARC Products?
The Multi-Ripper, SCARC (SHanks-on-an-ARC) products, are the most powerful excavator rock rippers and rock ripper bucket combinations on the market.
How do I benefit?
These products rip rock up to 4 times faster than a hammer. They rip 10 times faster than a single
pointed ripper. They exceed all other designs of frost rock, or ripper buckets on the market. They rip to all depths leaving relatively flat bottom and side walls in the trench.
How do they do this?
The staggered shanks on an arc hit one at a time allowing the maximum breakout to be applied to each tooth. The tooth force is about 8.5 times that of a standard 5 tooth bucket because the shanks are short. Also, the shanks are the same distance from the stick pivot, so the shanks rip a relatively flat bottom.
Why should I believe that it works?
These products are patented in the US and in many countries throughout the world. This design won several design awards. Many customers have claimed this is the best attachment I’ve ever bought.
What’s a Multi-Ripper? (not a bucket)
The MR has three or four short shanks that are wider than the stick, arranged such that each tooth hits one at a time at the optimum ripping angle. The MR is great for general rock or frost ripping, or open areas, or when the excavator has a quick change coupler installed.
What’s a Multi-Ripper Bucket?
The MRB is almost as powerful as the MR but allows the operator to rip and scoop with the same attachment. The MRB is about half the capacity of a conventional bucket, but has the ripping force of about 7.5 times that of a conventional (5) tooth bucket. The capacity is usually not an issue when ripping rock anyway, because the operator will be happy to be able to rip and fill the bucket with rock.
What’s a Hi-Cap Multi-Ripper Bucket?
The HCMRB is about 10% less powerful as the MRB, but has the capacity of about equal to that of a conventional bucket, (but still about 7 times more breakout force). This bucket is great if the job is large and there will be at least two weeks of rock ripping involved. This bucket can be used with a coupler, however, it works best if pinned directly to the machine to achieve the shortest tip radius for maximum breakout forces.
What is a V-Raptor Bucket?
The V-Raptor is a narrow Vee bucket used for ripping narrow V trenches in rock, plus having a capacity for removing the ripped rock. The bucket is also good for stump removal, prying boulders or slabs.
What is a DigNRip Bucket?
A DigNRip Bucket is the predecessor to the Multi-Ripper Bucket. There are shanks on the back. The severe ripping effect is similar except the front leading edge is about the same as a conventional bucket so the teeth do not hit one at a time. Because the teeth are on the back, the tip radius is a little longer and the visibility is less because the operator cannot see the rippers. Plus, the DigNRip bucket always leaves a layer of ripped material in the trench because the rippers are behind the front leading edge. The Multi-Ripper Bucket rips the material and then the loose material goes into the bucket leaving the trench clean. DigNRip buckets are great for digging and loading such as a quarry or a rock pit where high productivity removal of medium hardness rock is required.
What is a Multi-Ripper Tooth?
The Multi-Ripper Tooth is a vast improvement over the conventional twin tiger rock ripping tooth. The tooth is similar to a twin tiger style except twistedin order to produce high penetration, yet still effectively rip the sides of the trench. No other tooth provides the penetration of a single spike and the side wall ripping like that of the Multi-Ripper Tooth.
Why is ripping the rock faster than using a hammer?
Rock is usually very strong in compression, but weak in tension. Concrete for example, is extremely strong in compression, but like a piece of chalk, if pulled or bent, will break much easier. Hammers put the material in compression, so the hammer has to be very forceful in order to break the material. A ripper pulls the material apart, so the force can be substantially less. As long as there is a place for the material to go, the ripping can occur.
How do I know if these products will work with the rock or material on our project?
If the rock is rippable, the products will work. So, if a dozer will rip the material, or, you can gouge the material with a corner tooth of your bucket, then the Multi-Ripper Products will work. If however, a corner bucket tooth only glides over the surface, and cannot even scratch the material, then the Multi-Ripper products will not work. We have found that most rock is rippable.
If I provide you information on the rock we have, can you tell me if the rock will rip with your product?
No. There has not been a good scientific method of comparing these compressive measures with the rock strength in tension. Most of these measures relate to the rocks compressive strength. Seismic velocity has been generally compared to rippability, and this chart can be found in documents on the internet.
What is HARDOX and why is it used in your product?
HARDOX is the brand name of a Swedish steel that has been vacuum purified to give the steel not only hardness, but toughness. AR400 for example, has not been vacuum purified, and has a tendency to de-laminate and crack if used as structural member. Most uses of AR400 are for armoured products that need hard flat surfaces for wear and not necessarily for structure. HARDOX is great for wear and for toughness. Adding extra plates or adding hard-facing is not necessary, and not recommended. Hard-facing can actually cause damage to the HARDOX material by inducing tiny cracks in the material, and will thus void our warranty. If any welding is required or desired, please contact ONTRAC Group for the special HARDOX welding procedure.
What do we do if some of the rock is not rippable?
Most rock is rippable, however, some are not, so many contractors may have a machine that is plumbed for a hammer ready for those applications. Non rippable rock must be broken using a hammer, or, with blasting. The more rock that can be ripped with a Multi-Ripper Product, the better off you are because a Multi-Ripper product is far more productive and requires far cost less to operate, but, sometimes the use of a hammer is not avoidable.
Why can’t I get any tooth that I want?
We have tested many teeth that are on the market, and because the force produced at by a Multi-Ripper Product is so high, only the strongest teeth survive.
Do they come with linkage pins and teeth?
The units do come with one set of teeth, but they do not come automatically with coupler dead pins. Coupler non-greasable pins can be ordered separately if you have a coupler.
Do you make them for other types of couplers?
We make them for almost all coupler types except Bobcat. Please call for more information.