www.supertoolinc.com. This chart allows for drill oversize based on research done by the United States Cutting Tool Institute.
Come in sizes 1/1000th inches above or below standard key sizes.For example, an oversize reamer measuring 0.2510″ or undersize of0.2490″ are offered as alternatives to a 1/4″ or 0.2500″ reamer; These sizes will allow the user to create a tighter or looser hole thanthe standard fractional size; Special Decimal Sizes My preferred method for calculating the drill bit size is to take the desired finished hole diameter and multiply it by 0.98. Sizes 7/0 to 3/0 will only need 1 size drill. The amount of material left in the hole prior to reaming “pre-ream hole size” plays an integral role in the quality of the reamed hole. Click here to download a printable PDF of the Pre-Ream-Drill-Hole-Size-Chart. There are several ways in which the pre-ream hole size may be obtained some examples include investment casting, boring, line boring, rough reaming, and stamping. Reaming with Coolant and Reaming with Coolant Part II. Water-soluble coolants tend to ream slightly larger, dry reaming larger yet, while cutting oils tend to produce a tighter hole. Fiscal Budget or Congressional Shopping Cart? This gives you the range of stock removal best suited to the finish ream hole size. Right Hand Spiral Flutes vs. Straight Flutes. 941-751-9677 Greyzed Theme created by, Super Tool – Precision Cutting Tool Manufacturer, Reaming with Left Hand Spiral Flutes vs. Most machinists do not have time to wait for a special size drill bit to be made and are forced to choose among standard drill bit sizes that are on the shelf.
From that range refer to a standard drill chart to chose the appropriate standard drill size for your pre reamed hole size. Super Tool, Inc.
Therefore, the appropriate range of the pre-ream drill hole size for a 0.7500” finished hole is 0.7275” – 0.7350”. A 0.7500” diameter reamer should remove between 0.0150”-0.0225” of stock.
From that range refer to a standard drill chart to chose the appropriate standard drill size for your pre reamed hole size. Then take the desired finished hole size and multiply it by 0.97.
Therefore, the appropriate range of the pre-ream drill hole size for a 0.2500” finished hole is 0.2425” – 0.2450”. This leads to premature tool wear and poor hole finishes. The appropriate amount of stock removal for carbide tipped and solid carbide reamers is generally 2 – 3 percent of the finished hole size.
Over/Under Reamers. Coolant is one of the many things that affect hole size when reaming; coolant type, how the coolant is applied or not applied needs to be considered. Here you can study how the lubricity of your coolant effects the hole size and you can tweak in the perfect combination of stock removal, speed, feed, coolant type, and coolant application. If you are fine tuning your operation and are within the 2%-3% range, Super Tool recommends removing 2% of the reamer diameter for steels and tough alloys and 3% for non-ferrous and cast iron materials. This chart tells the appropriate standard drill bit size to choose when reaming fractional diameters from 1/8” to 1” in 1/64” increments. I have included a Pre-Ream Drill Hole Size Chart below to help with this selection. A 0.2500” diameter reamer should remove between 0.0050”-0.0075” of stock. Flood coolant produces a more consistent hole size than brushing coolant on the flutes during the cycle. Bryan Enander All Rights Reserved. This gives you the range of stock removal best suited to the finish ream hole size. The 2 – 3% stock removal rule provides for an optimized stock removal when production reaming with carbide or carbide tipped. When you’re reaming hundreds or thousands of the same hole is where the science of reaming combined with the art come together in the reaming application. Stock removal is an important aspect of reaming however we encourage you to review our previous blogs as we tie together all of the elements of the reamed hole. Carbide tipped and Solid Carbide Reamers need to have adequate stock to remove or they will rub in the hole and generate excessive heat. The pre-ream hole size affects characteristics in the reamed hole including hole finish, hole straightness, tool life, and cycle time. Below are examples for calculating the pre-ream drill hole size for a 0.7500” finished hole diameter and a 0.2500” finished hole diameter. In our blog, we are typically addressing production reaming with carbide so the charts and formulas provided give an accurate picture for the “one off” reamed hole as well as the “I have a thousand of these holes to ream” shop. Check back with us next week.
The World of Legal Marijuana…or Semi-Legal Marijuana, Corporate America, Inversion, and Tax Problems. The 2%-3% rule is great in theory. FINAL HOLE REAMER SIZE: Reduce Drill Hole Size By (mm) Reduce Drill Hole Size By (inch) mm: inch: MIN: MAX: MIN: MAX: 0.20mm.00787"-0.04mm-0.06mm-0.00157"-0.00236" Below are examples for calculating the pre-ream drill hole size for a 0.7500” finished hole diameter and a 0.2500” finished hole diameter. 1/64th stock removal up to 0.750 Dia and 1/32nd stock removal over 0.750 Dia is one of those great job shop rules of thumb that work for the “one off” reamed hole and typically involved cobalt or HSS reamers.
In the real world drill bits come in standard sizes. If you are rough reaming, stock removal can be up to 5% of the reamer diameter. To find the number and sizes of drills to be used to step drill hole(s) prior to reaming taper pin hole to fit standard taper pins, use the chart on page 1 to to find the length of pin to be used and follow the taper pin length dot to the drill diameter size to use. The most common way to obtain the pre-ream hole size is through drilling and the focus of this blog entry. Click here to download a printable PDF of the Pre-Ream-Drill-Hole-Size-Chart pictured above. If you have any questions about Pre-Ream Drill Hole Sizes (or any other cutting tool questions) feel free to leave us a comment here on our blog or fill out the form on Super Tool’s Contact Us Page.
0.7500 x 0.98 = 0.7350 0.7500 x 0.97 = 0.7275. Carbide Tipped and Solid Carbide Cutting Tools, © 2010 Super Tool – Precision Cutting Tool Manufacturer.
0.2500 x 0.98 = 0.2450 0.2500 x 0.97 = 0.2425.
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