Core Drilling thru Precast Concrete Plank

Tuesday, May 30, 2017 4:08:27 PM America/New_York

Core drilling precast concrete plank would follow the same procedures as with drilling a regular hole except you would use diamond core drill bits made especially for cutting thru the precast panels. Remember that precast plank is a structural system and it is recommended that you consult with an engineer on your project before core drilling. 

lazyloadClick Here for Diamond Core Bits for Precast Plank/Prestressed Concrete

Comments | Posted in How-To Guides By Richard D'Egidio

Husqvarna K970 Power Cutters Video

Tuesday, September 23, 2014 7:15:21 PM America/New_York


Comments | Posted in How-To Guides By Gregory Wiktor

Gas Mixture Calculation Chart

Monday, July 21, 2014 3:10:35 PM America/New_York

How to mix gas and calculate volumes :


How to figure out mix ratios: Ok you got some number like 30:1 or 50:1 or whatever and you want to know how much oil to mix in the amount of gas you have... first need like units ie.. gallons (gal) and gallons or ounces (oz) and ounces. Normally gas is in gallons and 2 cycle oil is in ounces so we need to convert one to the other ... just convert gallons to ounces.

There are 128 oz in a gallon. - trust me!!.

128 oz of gas mixed 50:1 = 128oz / 50 parts = 2.56oz Yes when you add in the oil there will be 51 total parts this is not a problem you are using a mix ratio Ie. mix 50 cups of gas with 1 cup of oil ... or ... 50:1 ... Ok ???

Don't over analyze this: The engineers of the motor's for our weed wackers tried to make it easy on us, so any redneck could have a long career in the mowing business ... ok.

Or for the math people ... Where

G = Gallon(s) of gas you have.
M = Mix Constant (ie 50 if you are using 50:1)

G * 128
------- = oz's of oil to add


If you are still confused just use the chart below... find how much gas you got on top and your ratio on the side and meet them to find the amount of oil you will need. "In ounces (oz)"


Gal/mix 0.5 1.0 1.5 2.0 2.5 3.0 5.0 10.0
20:1 3.20 6.40 9.60 12.80 16.00 22.40 32.00 64.00
25:1 2.56 5.12 7.68 10.24 12.80 15.36 25.60 51.20
30:1 2.13 4.26 6.39 8.53 10.66 12.80 21.33 42.66
35:1 1.82 3.65 5.48 7.31 9.14 10.97 18.28 36.57
40:1 1.60 3.20 4.80 6.40 8.00 9.60 16.00 32.00
50:1 1.28 2.56 3.84 5.12 6.40 7.68 12.80 25.60
100:1 0.64 1.28 1.92 2.56 3.20 3.84 6.4 12.8
Comments | Posted in How-To Guides By Gregory Wiktor

Twist Drilling vs Annular Cutting - A Primer

Friday, July 18, 2014 12:08:13 PM America/New_York

Twist Drilling vs. Annular Cutting – A Primer

by Tom Carroll, CS Unitec

Portable drilling in applications such as construction, steel fabrication and more poses many challenges - the method of hole creation is just one of them. Understanding the difference between twist drilling and annular cutting, and the equipment, power and time required, will have you efficiently and expertly cutting holes in steel, stainless steel and other metals.

Metal Removal: Conventional twist drill vs. annular cutter

The Methods:
Twist drilling, the creation of holes in metal with a drill bit, is probably the most recognized method of hole making. But, with only two cutting edges, twist drills require more time, power and slower feed rates because the complete area of the hole is removed and turned into chips.

Annular cutting, the cutting of metal with a hollow-core bit, is an efficient way to create holes 7/16" to 5" diameter (up to 3" deep) with an accuracy of +0.004", -0.000" in steel, stainless steel, etc. Multiple cutting teeth cut only the material around the periphery of the hole, forming a solid metal slug. In fact, the wall thickness of the cutter is approximately 1/4" thick, meaning that no matter what size hole you are cutting, you are only removing a small amount of material around the edge of the hole. Because the cutting surface of annular cutters is spread out over multiple cutting edges (teeth), they remain sharper longer and can create 5 to 10 times more holes than traditional twist drills. Final holes are smooth and burr-free - no reaming is required. Additionally, hole cutting with annular cutters requires no predrilling or stepdrilling. Annular cutters are commonly used to do on-site repair and to make mechanical openings and pipe thru holes.

The annular cutter creates the hole in a 3-step process:

1. The pilot pin accurately centers the cutter over the area to be drilled.

2. During drilling, the pilot pin retracts and allows the internal lubrication to reach the cutting teeth.

3. When the hole is complete, the slug is automatically ejected from the cutter, leaving an accurate, finished hole.

Another unique feature of annular cutters is their tapered inner wall. On high-quality precision-engineered cutters, the tapered wall design serves two functions. Primarily, it accommodates for the effect of frictional heat, which causes the expansion of both the cutter and the internal metal slug (coupon). Secondly, it facilitates the smooth, easy ejection of the slug.

When preparing to drill holes on-site or in the shop, it is important to consider the method of drilling as well as the equipment, power and time required to complete the project. These factors will help you determine the best method to complete your hole-making project.

Twist Drilling – Bringing the Workpiece to the Machine:
Both annular cutting and twist drilling require a drill press or machine to turn the cutting tool. Due to the physical design of the drill bit, twist drilling requires a machine with more horsepower - most often a bulky, bench-mounted machine that is traditionally vertically configured and less portable. To explain, the speed of the twist drill, at its center, is zero. A large amount of force is needed to "push" the material from directly under the tip of the bit outward, where the two cutting edges can bite and convert the solid material into chips. The larger the hole, the more time and horsepower are required to evacuate the material.

Annular Cutting – Bringing the Machine to the Workpiece:
Alternatively, annular cutters can cut at higher feed rates with lower horsepower consumption, meaning they can run on smaller machines and drill 3x to 4x faster. For instance, holes that used to be made with conventional twist drills on heavy, bulky, 70-80 lb. machines can now be made on smaller, lighter (approximately 24 lb.) portable machines. A wide variety of portable magneticmounted drills exist to drill holes, on-site, for repair or construction on structural steel. These newer, lightweight machines can also be used in manufacturing or fabrication shops. Configurable in both horizontal and vertical positions, magnetic drills are also available with pneumatic or hydraulic power for underwater/hazardous locations.

Application Considerations:
Hole Size:
Twist drilling, generally, is ideal only for holes up to 1/2” diameter. Holes over 1/2” are best handled by annular cutters. Twist drills are available in more precise diameters – annular cutters increase by 1/16”, whereas twist drills are available in increments of 1/32”.

Hole Type:
Twist drills are ideal for blind holes in applications where the hole does not need to go completely through the material. Additionally, they are good candidates for creating starter holes when tapping, as twist drills are available in more exact fractional sizes. Less chatter and drift is experienced when annular cutting thru holes, leaving a more symmetrical and accurate hole. Applications involving overlapping holes are also more easily managed with annular cutters.

Hole Location:
In addition to the aforementioned drilling capabilities afforded by portable drills and annular cutters, another consideration is hole location and finish. Annular cutters drill holes that are otherwise difficult or impossible with twist drills – there is no predrilling or step drilling required. Annular cutters are also ideal candidates for applications where a finished, burr-free hole is needed. This includes drilling pipe or tubing where special tools or manual scraping are not feasible or possible in the middle of a difficult-to-access cylinder.


The Conclusion:
Unless you’re making blind holes or holes less than ½” diameter, annular cutting is worthy of serious consideration, especially if your application is not under controlled shop conditions. TiAlN-coated annular cutters are available for applications where the use of lubrication or coolant is not practical – i.e. horizontal drilling or where material or environmental contamination is a concern. One final benefit of annular cutting is evident after the job is complete – cleanup and recycling. When twist drilling, many sharp chips are intermingled with the lubricant. Separating the two for environmental and recycling purposes is difficult, time consuming and costly. Scrap from annular cutters consists of a minimal amount of swarf and a solid slug. Separating a solid chunk of metal is easier, plus it will generate more profit when selling back the scrap.


Comments | Posted in How-To Guides By Gregory Wiktor

Concrete Cutters Pro How-To Guide

Monday, June 16, 2014 11:49:07 AM America/New_York

A full guide to concrete core cutting and sawing: lazyload
Click the image to download the full Concrete Core Cutting Guide as a PDF.

Comments | Posted in How-To Guides By Gregory Wiktor

Blade Cutting Speeds

Monday, June 16, 2014 11:39:55 AM America/New_York


Comments | Posted in Diamond Blade Cutting Speed Charts By Gregory Wiktor

About Diamond Blades

Thursday, May 15, 2014 12:04:00 PM America/New_York

  What a Diamond Blade is Made of   Builders Depot ® Diamond Blades are designed for the Professional Contractor. You Will Not Find A Better Product For A Better Price.  All of our Blades are Manufactured for a particular cutting application and if you are not sure, feel free to call us at 800-777-0969.!  We only offer the highest quality products.  We Have Blades For Every Application: Green Concrete, Cured Concrete, Asphalt, Brick & Block, Pavers, Natural Stone, Porcelain Tile, Glass Tile, Granite and General Purpose Blades for both Wet or Dry Use!
     For Special Applications or Help Choosing the proper blade for your materials, Feel free to call us at 1-800-777-0969 (direct, no menus M-F 8-6).
    Technical Notes about Diamond Blades and Materials
    The picture and information above are courtesy of Diamond Products, a leading manufacturer of diamond tools of which Builders Depot ® is a proud distributor. 
Comments | Posted in How-To Guides By Gregory Wiktor