Machining is basically one material removal process where excess material is gradually removed from the workpiece in the form of chip by feeding the cutting tool against the workpiece. In order to smoothly remove material, three relative motions between tool and workpiece are to be provided. Such motions are cutting velocity (or cutting speed), feed rate and depth of cut. Since these three parameters are inherent to any conventional machining process, so they are also called cutting parameters.

Productivity requirement—In case of higher productivity requirement, feed rate can be increased, if surface quality can be sacrificed. Otherwise, cutting speed (rpm) can be increased maintaining feed rate unchanged.

Helicalcutterhead Planer

How inconvenient is the process of replacing the knives, reinstalling and then maintaining the cutterhead so it accurately manages the cutting edges?

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Helical-path cutterheads have been around long enough to know that there’s no downside to any aspect of the maintenance or operation, you’ll begin saving money the minute you install them in your machine. The only drawback is that initial investment is larger than a simple carbide-tipper router bit.

That’s 8-10 times more efficient straight away. But the kicker is you can then rotate each knife four times before replacing it. This means the knives will last up to 40 times longer than straight blade knives. Yep, you read correctly. All cutterheads come standard with solid carbide knives and replacement packets of 10 are available separately.

That’s because these cutterheads are basically offering the opportunity to confine a series of prolonged and hidden costs into one direct payment. So ask yourself a few questions:

Helical vs spiral cutter headreddit

Permissible feed rate—Machine tools have a maximum and minimum limit of feed rate, beyond which, selection is not permitted. Again, conventional machine tools may have only few feed rate options within that range.

One of the problems our industry faces at the moment - and one of the reasons we get a lot of questions - is the variance of confusing terms that apply to cheaper machines.

Surface finish requirement—Lower feed rate gives good surface finish. So if operation is rough cut then a higher value can be considered. For example, for rough turning a feed rate of 0.1 – 0.3mm/rev can be taken; whereas, for finishing pass, 0.01 – 0.05mm/rev can be considered.

You cannot find a machine under $1,000 that has helical-path spiral cutterheads - sure, they might have spiral cutterheads - but without the helical path engineering, they don’t have any of the spiral cutterhead advantages. So you can see why they still use the term ‘Spiral Head’.

Value of feed rate affects machining performance and economy, so an optimum value is always desirable. Typical values for feed rate in several conventional machining operations are provided below.

SFM. Surface Feet per Minute. RPM. Diameter · Formula: RPM ÷ 3.82 x Dia = SFM ; RPM. Revolutions per Minute. SFM. Diameter · Formula: SFM x 3.82 ÷ Dia = RPM ; IPM.

You will only need to replace the inserts when four edges are dull. Compare this to your speed-steel knives and you’ll think your machine has discovered the fountain of youth.

Instead of punching the material at 90°, one knife shears smoothly across the timber, before the next knife engages at the exact same angle. It’s far less work for your machine’s motor, which means true shear-cut helical spiral heads require less horsepower.

So don’t get confused by the misleading language here – check that the machine’s knives cut with a helical spiral pattern, that they have the extra-width and they’re not just imposters.

HelicalBenchtop planer

Prior to machining, selection of optimum feed rate is crucial as a number of factors are affected by the process parameter. An optimization can help finding out suitable range for feed rate for machining a particular material under specific conditions and cutting environment. However, considering all possible factors is sometime difficult and thus, in machine shop, its value is commonly selected from practical experience. The following table displays the impacts on machining performance if feed rate is improper.

The extra-width means each tip passes over more of the material, leaving a smoother finish. It’s a smarter, more efficient design that not only improves cuts and machine-lifespan, but can save you a ton in replacement blades. But we’ll get to that later.

Since feed rate is one of the three cutting parameters so its value has to be selected carefully prior to the actual machining operation. Improper feed rate can lead to inaccuracy in machining and thus production of rejected parts. Feed rate affects machining performance in many ways—surface finish to tool life, as discussed below. For detail, you may also read effects of feed rate on machining performance.

Also known as the table feed, machine feed, or feed speed. It is the feed of the tool in relation to the workpiece in distance per time unit related to feed per ...

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Due to the complicated nature of designing each blade at a relative angle to each other, there is significantly higher cost in engineering and precision machining a helical pattern.

Well it’s about to be the same with helical-path spiral cutterheads. You only have to rotate your spiral-head knives once for every 8-10 blade changes on straight high-speed steel blades.

Machine capability—Higher feed rate causes high cutting force and vibration. Depending on the capability of machine tool to absorb and transmit such forces and vibrations, feed rate should be chosen.

Spiralcutterheadvsstraight knives

One of the questions we encounter nearly everyday is ‘What's the difference between the spiral cutterhead on this $500 thicknesser and this $1,200 thicknesser?'

Helical vs spiralcutterhead planer

They also make smaller chips and operate with far less noise than other types of cutterheads. Unlike conventional single straight knifes, you don’t even need to replace the knife if it becomes damaged or dull. Instead, if one knife edge is damaged or needs sharpening, simply turn it to another edge in seconds.

Sep 2, 2019 — Carbide - If Superman was a Drill Bit. Solid Carbide drill bits are ... TiN or Titanium Nitride. TiN extends the drill life and is an ...

Take some time to think it over and if you’re still uncertain about any step of the process get in contact. Like any innovation, there’s a start-up cost, but boy is it smooth-sailing when you finally leave the harbour…

The helical-path spiral head uses 27mm-wide knives - these are almost double the standard 14-15mm knives on other segmented cutterheads, creating a finish twice as smooth, twice as quickly.

It's usually followed by 'How much longer do spiral cutterheads actually last than regular straight edge?’ They're the kind of repetitive questions we don’t mind answering, because it reminds us a little of when router bits evolved from high-speed steel to carbide tipped: honestly, the look on a few of our customer’s faces when we let them in on the worst kept secret in woodworking is pretty rewarding.

Helical vs spiral head

Then, when you eventually do need to replace them, they screw in evenly in a matter of seconds – no more jigs to align them with each other.

Jan 31, 2021 — Cut taps do tend to break more often than 'roll forming taps'. Forming Taps. Thread forming (roll forming) taps deform material to produce the ...

Woodworkers buy these type of cutterheads for the quality of the cut and the removal of stress on their machine alone, but approaching the argument on a purely cost-for-cost basis, they’re an expensive proposition in one-hit.

HelicalJointer

But after doing some research it turns out there’s some misleading language out there, and we think it’s time someone clarified the situation once and for all…

Feed rate is one of the cutting parameters, which is provided for moving the tool against the workpiece for covering the entire surface to be machined. Usually it is imparted in a direction perpendicular to cutting velocity; however, the angle between cutting velocity vector and feed vector may also deviate from 90º. The following schematic diagram for straight turning operation shows the feed direction in conjunction with speed and depth of cut.

2020813 — Cobalt drill bits are generally the preferred choice for drilling hardened metal or stainless steel as it performs the job well and at a ...

There exist a large number of factors which should be considered for selecting an optimum value of feed rate, as discussed below. Note that the following list is just few of such factors that need consideration while choosing feed rate value.

Helical-path spiral cutterheads are designed with a true shear cut, which means the knives are arranged in a helical spiral pattern and set at relative angles.

M2 x 0.4, 0.4, 6g, 1.981, 1.886, 1.721, 1.654, 1.548, 1.408. M2 x 0.4, 0.4, 6h, 2.000, 1.905, 1.740, 1.673, 1.567, 1.427. M2 x 0.4, 0.4, 4g6g, 1.981, 1.886 ...

In case you’re wondering what we’re talking about, helical path spiral cutterheads are the new in-vogue addition to any thicknesser or jointer that’s worth the timber it planes.

202358 — However, 135-degree split points require more pressure and power to drill than 118-degree ones. They can also dull faster than 118-degree. 118- ...

Helicalplanerheadfor Dewalt 735

When router bits transformed from high-speed steel to tungsten tipped it increased the lifespan of your average bit by about 8-10 times.

Typically, a good everyday use pocket knife is about 57-59 HRC. You will be perfectly happy with a steel that hard. We have great success hardening 8Cr13MoV to ...

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Cutting tool geometry—Beside feed rate, tool geometry also affects surface quality. So, if geometry permits, then a higher value can be selected.

Various machining operation use different unit in order to express feed rate in the most suitable way particularly for that process. The below list displays the common unit of feed rate used in various machining operations. Irrespective of the unit, the purpose of the feed rate remains unaltered as discussed earlier.

Nickel alloys possess excellent mechanical properties, including high tensile strength, toughness, and durability. These alloys are used in critical structural ...