A rotary hammer creates its hammering action with a piston. When the power trigger is pulled, the piston moves forward with force inside the cylinder. This action simultaneously creates high air pressure within the cylinder walls and rushes the air pressure with strong velocity out to the hammer mechanism. This pounding power is measured in “pounds of impact energy”.
@TheSpartanempire2011
https://www.maxtool.com/blogs/news/its-hammer-time-hammer-drills-vs-rotary-hammers
Strange!!! People use these rotary hammers to drive posts and I ordered a Post Driver SDS-Plus bit direct from China (half the price that Bezos' charged).... So now I wait for the post driver bit to arrive....
The Harbor Fright Bauer compares to the Bosch Bulldog that has 2.5760541018 newtons - More than the Gas Power Driver! No wait - the Honda 35x engine is 47.4536 Joules.
27.5 Joules is the most powerful Cordless rotary hammer I can find.... (Makita) super expensive of course. Just the tool is $900 and then another $500 for batteries... whereas I spent $200 TOTAL.
The hammer on this is a pressure hammer - so the Foot-lbs is just torque and not force as Newtons ft-lb. I realized my error from a youtube comment - as I kept researching rotary hammers. hahahaha. So definitely not as powerful as the GPD - especially due to the weight difference vid test Oh wait that's the CORDED Bauer... here is cordless
One joule equals the amount of work that is done when 1 Newton of force moves an object over a distance of 1 meter.
So the Bosch cordless equivalent rotary hammer equivalent is ...
Its powerful motor delivers 2.6 Joules of impact energy, providing fast material removal rates.
HF offered a FREE $90 tool with 3 ampHour battery purchase $60 but I also got the 8 amp hour battery ($90) that should have MORE power - so it claims - but also needed a new bigger 3 amp rapid charger (another $35)....
The goal is to drive down 30 feet of wellpoint pipe.... but the Gas Power Driver only got 8 inches before I sheared off the stainless steel!!
SDS bits (Slotted Drive System) have grooves on the shanks that lock securely into SDS-Plus/MAX chucks. They are designed to allow the bit to move forward and backwards independently of the chuck. Very easy to install and remove. They almost remind me of how impact drivers work.
SDS drills will drill at least three times faster than a hammer drill. They also have the option on no turn, hammer only that make it great forhow Rotary hammers work vid
I also have a Hilti TE-10 rotary hammer that uses SDS drill bits and delivers 400 blows per minute, and that sucker will drill a 5/16 inch hole in concrete about as fast as a cordless drill can drill a 5/16 inch hole in wood. And, it's all because each blow is powerful enough to bash some concrete into dust.
So my plan is to also use this tool for drilling the Shiitake inoculation logs for the Shiitake farm!!
So the Milwaukee version of this same tool is priced at $250 just for the tool - no batteries!!
So I paid $200 for the new charger, 8 amp hour battery, 3 amp hour battery and new tool....and gas money to the store a few times....
https://www.boschtools.com/us/en/products/gbh18v-24cn-0611923014
The Bosch is $300 - but I think that includes a smaller battery...NOPE - just the tool!! And the Cordless is rated the same as the corded for Newtons!! Wow.
Superior Impact: Delivers 1.8 ft-lbs. of impact energy (EPTA) for maximum performance in heavy-duty applications in concrete.
Wow - So Bauer is a lot cheaper - maybe one third the price....
SDS drills will drill at least three times faster than a hammer drill. They also have the option on no turn, hammer only that make it great for chisels. Bits never slip in a SDS either which they do in a hammer drill.
too bad I can't get the special Shiitake bit for an SDS-Plus....or SDS...?
9.2mm is the Shiitake bit size - so if I get a .36 bit - for SDS - then use the drill gauge - that will work!!
https://www.smithbearing.com/images/pdf/ENG-FractionalChart.pdf
59/64 sds drill bit .92mm #64
hmm - no one has one? hahaha
https://flexcoat.com/wp-content/uploads/2009/10/size_conversion_chart.pdf
I think 3/8" will work!!
https://www.drillbitwarehouse.com/product/sds-plus-concrete-drill-bit-with-drill-stop-bit/
That has a stop just like the Mushroom drill bit!! hmmm
https://www.drillbitwarehouse.com/product/sds-plus-concrete-and-masonry-hammer-bits/
FYI Ft*lbs isn't only a unit of torque, it's also a unit of work (energy). For torque, the foot part of the unit is the distance from center that the force is applied, for work it's the distance that a force is applied over (if you push with a force of 5 lbs for a distance of 1 ft, you've done 5 ft*lbs of work). In examples like this people often (understandably) assume that 1ft*lb = 1ft*lb, but no. Not when the vector of the two units is 90 degrees different. That vector is not included in the units and that change makes them entirely different and non-correlatable. Foot-pounds of torque are 1ft * 1lb of force. "Foot-pounds" of energy (also used for e.g. bullets) are foot-per-second (squared) pounds, or 1 lb * 1 (ft/s)^2. torque is a cross-product (and a vector quantity) while energy is a dot product (and a scalar quantity)
My neighbor fashioned a "cup" or socket in lg. sds to drive copper ground rods in. Unless you hit a big rock, it's going in. If you hit a small rock it either displaces it or breaks it. I'm not surprised at the relative amount of chooch here.. Really neat tools.
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