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A. CONCRETE PILES:
1) Drill the top hole using 3/8-in bit (Hammer Drill)
2) Remove the drill bit to use Auto Punch - this is the best punch (do NOT use hand-held hammer with Auto Punch).
The old way of using "manual punch" is not as good.
3) Fasten the "Aluminum template". Drill the 2nd hole thru the big circle of this template. Remove the template. Finish drilling the 2nd hole to required hole depth.
Repeat step 2 for 2nd hole.
Video: Note re-punch (with a handheld hammer) is really NOT necessary. The auto punch is perfect: https://www.youtube.com/watch?v=Abm627_s2Jw
Supplies:
*Drill bit + auto punch combo: www.hilti.com #2112762 for $96
*Anchors: 1/4-in size www.hilti.com #409495
*Bolts: USA 1/4-in coarse thread, GRADE 8 (150000 psi = 1034 MPa). Important to get high strength bolts:
https://www.grainger.com/product/Hex-Tap-Bolt-Steel-21C363
*Bolts: For H piles, get longer bolts.
*Washers.
*Steel rope (to hang box from hammer): www.homedepot.com item 203958878 which is 3/16", 6-ft security cable
if homedepot stops this product, find "3/16", 6-ft security cable" on ebay (don't buy cable with vinyl coating - it's bad.)
on ebay, they have 4-ft length as well (don't buy cable with vinyl coating - it's bad. If vinyl coating, need 3/8").
or https://www.harborfreight.com/7-ft-x-38-in-braided-steel-security-cable-62410.html (too long and too thick)
*Spring link: www.homedepot.com item 205883003 (3.5-in, small, not quite good), 205887801 (4.7-in, OK), min 250 lbs. Do not use 110-lbs rated.
Metric size: M10: average; M12: OK.
SI unit (International market):
In this sketch:
"Best" anchor is flushed with pile surface.
"OK" anchor if you accidently drill hole a little bit deep. Still OK because you can use longer bolt.
"Bad" examples: will cause sensors to be bent (and pre-strain them)
Bad holes can cause strain gauges to be bent and:
+ initially compressed (e.g., > +3000 µe on Balance Check window)
+ initially over-extended (tension) (e.g., < -3000 µe on Balance Check window)
Within -3000 to +3000 initial offset (i.e., baseline), data is still OK, but prolong usage of bent gauges causes faster tear/ wear to the gauges.
B. STEEL PIPE PILES:
Bit size has to be at least 0.8-mm smaller than threaded tap, so that the thread has enough depth.
USA: tap (thread) size = 1/4-in, then bit size = 7/32-in is good (in USA, bolt is 1/4-in size, coarse thread).
C. STEEL H PILES:
Bit size has to be larger than bolt size (in USA, bolt is 1/4-in size, then bit = 9/32 or 5/16 or 3/8)
D. TIMBER PILES:
Drill pilot hole (very small pilot bits, such as 1/8-in).
Use lag bolts.
F. SENSORS:
sensor checking when on hand https://youtu.be/AVFYNzXHp94
sensor tightening to avoid bending https://youtu.be/mHZZGVf3_8Q, example on site: https://www.youtube.com/watch?v=9BPYR_DW_V0&t=45s
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