I purchased the Big Threader by Beall Tool Co. a couple years ago to try it out. It works brilliantly, but you need a router to power it. And setting the cut is fussy to get the results you want. It’s a lot like a router-powered dovetail jig in that once you get it set up, it’s brilliant. But the setup is a pain when you want to make one or two threaded rods.

The tap works with a 23mm-diameter hole. I recommend buying a 23mm Forstner instead of using 1-1/8”. You can buy these on eBay for less than $10. The tap cuts cleanly in both hardwoods and harder soft woods, such as yellow pine.

These results in a variety of wear patterns observed at the rake face and the flank face. We call this gradual wear of the tool.

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Types of tool wearpdf

It is common in case of milling operation. In milling, tools are subjected to cyclic thermal and mechanical loads. Teeth may fail by a mechanism not observed in continuous cutting. Thermal cracking can be reduced by reducing the cutting speed or by using a tool material grade with a higher thermal shock resistance.

After reading this article you will learn about:- 1. Meaning of Tool Wear 2. Types of Tool Wear 3. Causes 4. Growth 5. Forms 6. Consequences.

The threader and tap are extremely well made. And after experimenting with it a lot this winter, I can recommend it for those who can afford it. It makes crisp threads with little effort. Here are some helpful details if you follow me down this path.

C = Machining constant, found by experimentation or published data book. Depends on properties of tool materials, work piece and feed rate.

vi. The parameters used to measure the crater wear can be seen in the Fig. 9.18. The crater depth KT is the most commonly used parameter in evaluating the rake face wear.

When we cannot justify the purchase ourselves, then why not speak with other woodworkers in your area who might want to share the cost by having you do some pieces for them?

Dieter Schmid has a lot of customers in North America, so shipping was fast and easy. I had the tool in about two weeks.

From what I understand about threading item up to the shoulder of the work, you would have to modify the die so that the shoulder can reach the edge of the V cutter.

Flankwear

The wooden dowel should be 28mm or slightly undersized for the male threads. I turned my dowels from straight-grain maple to 1.10”, which slipped right into the threader with no wobble. This makes for crisp threads.

Edge chipping is commonly observed in milling operation. It may occur when the tool first contacts the part (Entry Failure) or, more commonly, when it exits the part (Exit Failure).

This is why I believe in Cooperative workshops. Everyone gets a bench space, share lumber storage and Larger tools. Then if one person does some specialty you all can share the work.

In the picture, the threads on the right look perfect, while those on the left look slightly chipped/cracked. Is this a light issue or is there an another explanation for this?

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Wear on the flank face (relief or clearance face) of the tool is called flank wear. The flank wear is shown in Fig. 9.17 (a, b, c).

The facture wear usually caused by breaking of edge at end or length. The bulk breakage is the most harmful and undesirable type of wear, and it should be avoided as far as possible.

How long is the tap? (Curious as to the max thickness of a piece of wood I could use.) Thanks. PS You forgot your customary link to your tool purchase disclaimer. ?

Due to flank wear, the plan geometry of a tool may disturb. This may affect the dimensions of the component produced. It may influence the shape of the component.

iii. It is somewhat normal for tool wear and does not seriously degrade the use of a tool until it becomes serious enough to cause a cutting edge failure.

NPTF taps are made to different specifications so that in addition to sealing on the flanks of the thread like the NPT form, the threads also seal at the ...

Diffusion of carbon in a relatively deep surface layer of the tool may cause softening and subsequent plastic flow of the tool. It may produce major changes in the tool geometry.

Jennie you are right about removing the collar. Mine did not come with instructions, and I didn’t think you could remove the collar’s nut without the knife falling out. But an 8mm wrench took the collar right off and there is a second nut inside holding the knife. Tricky Germans!

Flankwearand craterwear

A constituent of the work material diffusing into the tool may alter the physical properties of a surface layer of the tool. For example: The diffusion of lead into the tool may produce a thin brittle surface layer, this thin layer can be removed by chipping.

Looks very nice, but for the price I’d rather go with Benchcrafted hardware instead of making my own. Might be worth it to those trying to stay very traditional.

My only caveat to the tap is I recommend chamfering the entry hole or the leading cutter of the tap can, on occasion, splinter the work.

After struggling with the inexpensive wood-threading tools from China and Taiwan, I have been looking for a better way to tap and thread hardwoods.

I take the collar off so often I tapped the tool’s collar face and secured the collar by a slotted head bolt. And, there is another reason for easy collar removal. The collar is the perfect gauge when turning thread stock.

The average width of allowable flank wear varies from 0.2 mm (for a precision turning operation) to 1 mm (for a rough turning operation).

Wear on the rake face of the tool is called crater wear. As the name suggests, the shape of wear is that of a crater or a bowl. The crater wear is shown in Fig.9.18 (a, b, c).

Abrasive wear is basically caused by the impurities within the work piece material, such as carbon nitride and oxide compounds, as well as the built-up edge fragments. It is a mechanical type of wear. It is the main cause of the tool wear at low cutting speeds.

But after talking to Jennie at length, I bucked up and put the 28mm (approximately 1-1/8”) kit in my shopping cart (see all the sizes here). My rationale? I’d already spent $300 on non-functioning wood-threading kits, perhaps I should have just bought this German one at the outset.

iv. The crater wear can increase the working rake angle and reduce the cutting force, but it will also weaken the strength of the cutting edge.

So I’m happy to report that my search for a good wood-threading kit is over. It was an expensive journey, but I now have an excellent working tool that doesn’t require a router.

Entry failure most commonly occurs when the outer corner of the insert strikes the part first. This is more likely to occur when the cutter rake angles are positive. Entry failure is therefore most easily prevented by switching from positive to negative rake angle cutters.

I am afraid the groove is the best we can do short of tapping the handle. You can not thread from the other end. It is already threaded. To thread you must enter the tool and meet the cutter right off.

Craterwear

If we have to drive one nail, or drill one hole and cut one small board, then a lower cost throw away tool does the job. If however we do quality work repeatedly, then a premium tool works out as a better decision.

Due to high pressure and temperature at tool-chip interface, there is a tendency of hot chips to weld on to the tool rake face. This concept leads to subsequently formation and destruction of welded junctions. When the weld intermittently breaks away picking particles of cutting tool. This leads to a crater wear. Fig. 9.19 shows adhesive wear.

Initially, for the new cutting edge, the growth of wear is faster. The initial wear size is VB = 0.05 to 0.1 mm normally.

The nice thing about the threader is it makes threads with a square tip – not triangular. These square, acme-like threads are more durable. The downside to the threader is that it leaves a 1-1/2” long area of a handle unthreaded, as you can see in the photo above. This is caused by the long collar of the threader. The long collar improves the accuracy of the tool, so it’s a trade-off.

I appreciate your sensitivity about recommending high priced tools. But I encourage you to continue drawing attention to tool makers like Holtey, Sauer, Nelson and others who strive to attain the highest level of craftsmanship. These folks are doing amazing things and deserve all the support they can get. Being their advocate is something to be proud of.

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Tool wearandtoollife

iii. It results in the formation of wear land. Wear land formation is not always uniform along the major and minor cutting edge of the tool.

After the initial wear we found that the wear rate is relatively steady or constant. In this zone, the wear size is proportional to the cutting time.

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As the tool wear increases, the surface roughness of machined component also increases. This is particularly true for a tool worn by chipping .Although, there are circumstances, in which a wear land may burnish (polish) the work piece and produce a good finish.

vii. It occurs approximately at a height equal to the cutting depth of the material, i.e., Crater wear depth ⋍ cutting depth.

iii. Increase in feed results in increased force acting on tool interface, this leads to rise in temperature of tool-chip interface.

If you click the link above for different sizes, when you get to the Dieter Schmidt webpage, under the pic of the tool, there is a link to see pictures of threads made with the tool. The last one made from walnut, goes to the hub, so I’m guessing you could just flip the tool around.

Causesof tool wear

iv. Increase in cutting speed results in increased chip velocity at rake face, this leads to rise in temperature at chip-tool interface and so increase in crater wear.

Put a good coat of tallow all over the stock. Enough tallow will end up in the tool. Tallow is lard. I have heard that lard without additives will do. i have not tried it. If you use tallow, rend it at least three maybe four times. The cutter’s tool steel must be free of of anything but fat. The vendor suggests soaking stock in water for a period of time before threading. Turned wet stock will shrink and the wet cutter may rust. I am not going to try it.

Dieter Schmid is an excellent house! Top notch products and service. I have been doing business with them for several years, and I have been delighted with them. My involvement with them?…They distribute the Knew Concepts line of saws for woodworkers.

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Due to this effect voltage established between the work piece and tool. It may cause an electric current flow between the two. However, this type of wear has not been clearly developed.

The following Table 9.11 gives some recommended values of allowable average wear land (VB) for various operations and cutting tools:

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The tool matrix or a major strengthening constituent may be dissolved into the work and chip surfaces as they pass the tool. For example: Demand tool, cutting iron and steel is the typical examples of carbon diffusion.

v. It is more common in ductile materials like steel which produce long continuous chips. It is also more common in H.S.S. (High Speed Steel) tools than the ceramic or carbide tools which have much higher hot hardness.

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The cyclic variation in temperature in milling process induce cyclic thermal stress at the surface layer of the tool expands and contracts. It may leads to the formation of thermal fatigue cracks near the cutting edge.

Chris The tool is excellent. Bought it at Woodcraft Supply over 40 years ago. After a lot of use it works like new. The collar is no problem. When it stops you shy of a handle back the threader off, remove the collar and carefully continue threading. I have done this time after time and the threader without the collar works well. With no collar, you will still be shy a short distance-the distance between the threader face and the cutter. On my threader (which is stamped 7/8″) the threader without the collar stops short of the handle by about 3/16″. No big problem. When turning the handle and thread rod, right below the handle I turn a 3/16 ” wide flat bottom groove down to the thread’s base diameter. The handle now seats upon tapped stock. For most applications the groove is no problem. Chris, how wide would the groove be with your larger threader?

The tool is metric, and while you can get away with Imperial tooling, you’ll be better off switching your brain to metric for this operation.

Tool wear is generally a gradual process due to regular operation. Tool wear can be compare with the wear of the tip of an ordinary pencil. According to Australian standard, the tool wear can be defined as “The change of shape of the tool from its original shape, during cutting, resulting from the gradual loss of tool material”.

When the wear size increases to a critical value, the surface roughness of the machined surface decreases, cutting force and temperature increases rapidly, and the wear rate increases. Then the tool loses its cutting ability. In practice, this zone of wear should be avoided.

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The cutting forces are normally increased by wear of the tool. Crater wear, flank wear (or wear land formation) and chipping of cutting edge affect performance of the cutting tool in various ways. Crater wear may, however under certain circumstances, reduce forces by effectively increasing the rake angle of the tool. Clearance face (Flank or wear-land) wear and chipping almost invariably increase the cutting forces due to increased rubbing forces.

Flankwearin cuttingtool

The gradual wear is unavoidable but controllable. It is the wear which cannot be prevented. It has to occur after certain machining time.

The gradual wear can be controlled by remedial action. The gradual wear can be divided into two basic types of wear, corresponding to two regions in the cutting tool as shown in Fig. 9.16.

ii. The chips flows across the rake face develop severe friction between the chip and rake face. This produces a scar on the rake face which is usually parallel to the major cutting edge.

Thanks Chris, It has we do for some reason resist buying the right product for some faster, cheaper, or perceive more accurate method.

As we decide to sharpen a knife edge when the quality of the cut begins to deteriorate and the cutting forces required increase too much, similarly re-sharpen or replace cutting tools when.

I have looked at these for so long and just wasn’t sure I wanted to pony up the money and not be satisfied. Great review. Thanks.

Diffusion wear is usually caused by atomic transfer between contacting materials under high pressure and temperature conditions. This phenomena starts at chip-tool interface. At such elevated temperatures, some particles of tool materials diffuse into the chip material. It can also happen that some particles of work material also diffuse into the tool materials.

And once again you have a found a tool that I may not need but WANT ! When it comes to these tool tips Chris you are almost like a drug dealer [mean that in a nice way]. Ever since I bought the “pocketweez’ splinter puller I have not had a splinter in my hand.

I use the good old two handle wooden threader. I have a 1/2, 3/4 and a 1 1/8 I use them a fare amount . they were not cheap in any way but not as much as the one you got. and if you take off the starter guide you can run it within a 1/2 in. of the handle. I do how ever keep the cutter scary sharp.

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Certainly expense is a concern. This is a very reliable tool that among other things is always available to make, upon demand, numerous holding devices of wood that are no threat to your work, your tools or you.

Mostly, such cracks are perpendicular to the cutting edge and begin formation at the outer corner of the tool, spreading inward as cutting progresses. The growth of these cracks eventually leads to edge chipping or tool breakage. An insufficient coolant can promote crack formation.

One last detail about the tools: Jennie recommends using tallow on the cutter and I second that recommendation. The tallow makes the job easier and prevents chips from jamming into the V-cutter, which will spoil the dowel.

Tool wearmechanism

Cutting tools are subjected to an extremely severe rubbing process. They are in metal-to-metal contact between the chip and work piece, under high stress and temperature. The situation becomes severe due to the existence of extreme stress and temperature gradients near the surface of the tool.

i. It is the most important wear that appears on the flank surface parallel to the cutting edge. It is most commonly results from abrasive/adhesive wear of the cutting edge against the machined surface.

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It can be observed in high temperature region. The high temperature results in the formation of thermal-couple between the work piece and the tool.

While interviewing Jennie Alexander last May, she showed me her German tap and wood threader, a tool she has had for many years and worked perfectly. I’d seen this threader on the Dieter Schmid web site many times before, but the price was too high for me to take a gamble on it.

A wear land increases the tendency of a tool to dynamic instability or vibrations. When the tool is sharp, the cutting operation is quite free of vibrations. On the other hand, when the tool wears, the cutting operation is subjected to an unacceptable vibration and chatter mode.