THE TURNING TIMES - East Texas Woodturners Aug05.pdf · 2018. 3. 20. · THE TURNING TIMES Volume 13 Issue 8 An East Texas Woodturners Publication August 2005 President John Leonard

THE TURNING TIMES Volume 13 Issue 8 An East Texas Woodturners Publication August 2005

President John Leonard 903-592-6009 [email protected] Vice President Cary Grant 903-858-2112 [email protected] Treasurer Archie Stivner 903-876-4085 [email protected] Secretary Bill Holmes 903-894-4684 [email protected] Project Coordinator Ken Terrell 903-839-4735 [email protected] Librarian Willis Martin 903-593-3148 [email protected]

Visit us at www.easttexaswoodturners.org THE TURNING TIMES is published monthly as an information source for members of the East Texas Woodturners (ETW). ETW is a chapter of The American Association of Woodturners (AAW) and is committed to serving woodturners in the East Texas area surrounding Tyler, Texas. The ETW Chapter joins with the AAW in its dedication to providing education, information and organization to those interested in woodturning.

Meeting at TJC West August 13, 2005 @ 9:00 a.m.

Calendar of Events August 13, 2005

Regular Meeting September 10, 2005

Regular Meeting October 8, 2005

Regular Meeting at Centerpoint Gas Company Club Challenge Picnic

November 5, 2005 Regular Meeting

The Prez Says Hi gang. It must be summer as hot as it has

been. Hope you have been able to get out and turn some.

Tom Criswell’s demo on hollow turning was most interesting. Tom is so at ease turning and doing a demo and makes it look so easy. If you missed the demo, you will need to get the tape when Ed gets it ready as Tom showed several ways to do hollow turning. Good job, Tom.

This month we are doing something different. Tom Crosby will do a short demo on using micro mesh then Tom and Ed Heuslien will do a second short demo on coloring. After that we will have a panel of some of our more experienced turners to answer questions from the audience. So put your thinking caps on and lets make them squirm.

I just returned from the AAW Symposium in Kansas City, talk about hot it was over 100 ever day and up to 106 one day. But inside I spent a lot of time and money in the trade show. I was a little disappointed in the trade show, I though it would be bigger. The Instant Gallery was nice but I did not see many pieces that exceed what we have in our Show and Tell. Not to say that it wasn’t nice, it was, but we have some very talented folks in this club. I met a lot of folks that I have “talked to” on the Internet

We will begin sign ups for the Club picnic this month and continue them in September.

Don’t forget that our October meeting will be at Center Point Gas Company on Broadway across from Target. We will have our Club Challenge, followed by our Club picnic, and our first tool swap. We need a couple more intermediate turners for the team. We will set the teams at the August meeting.

See you on August 13th at TJC West at 9:00 AM till then stay cool. Seriously be careful in the heat we don’t want anyone down with a heat sickness.

John

August Demo

Tom Crosby – Micro Mesh Tom Crosby & Ed Heuslein – Coloring

Question & Answer Session

Table of Contents The Prez Says...........................................1 Classifieds ................................................2 Various News ...........................................2 Mentor List...............................................7

mailto:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]://www.easttexaswoodturners.org

Country Wood Pile A local store for your wood turning needs.

We now have 7 different CA glues from StarBond. A dealer for Jet, Powermatic, Performax,

Olson Blades, Gorilla Glue. Check us out. Hours:

10:00 to 6:00 Monday thru Friday 2215 S. Broadway

Tyler, Texas 75701 903 534-6016

FREEDOM PENS PROJECT The project has slowed down along with a lot of other things during this

hot and dry summer. However, it is still alive and well, and the East Texas Woodturners are still very much involved. In fact, I just last week had 20 pens sent to a unit in Afganistan for a lady who requested them for her son's unit.

Some of you have had pen kits for a couple months that you haven't returned yet. I am trying to get up enough to send out another batch of 100 so if you have been (like myself) occupied with other things, perhaps you could fine a few minutes between now and 8/13 to finish them and take them to the meeting with you. I really would like to get my inventory caught up.

If anyone wants to make some pens, contact me and I'll help you out. I have 20 kits right now, just waiting for a volunteer.

Thanks for your help.

Ed Heuslein

Classifieds WANT TO BUY: Electric power planer, Skil Model 100. Will buy working, OR NOT working for parts. Not interested in any other model or make. These planers are silver-gray color, kind of long in shape, and have not been made for a few years now. They often came with some accessories and a steel carrying case. Rick Wilbanks, Day: 595-3791 Home: 839-7084 Email: [email protected] Wanted: If you are considering upgrading to a varible speed mini-lathe, I am interested in you old mini. Paul Coppinger [email protected] 903 569 9780 For Sale: Nova 3000 Lathe - $600 Leon Mc Lemore [email protected] 903-882-0616 FOR SALE - NOVA 3000 lathe (16 inch swing) with a 230 volt Leeson 1 1/2 horse D.C. motor. Extras include: extra bed extension, metal stand, 500# sand,. steady rest, handwheel, 12 inch and 6 inch tool rests, drive spur, live center, and knockout bar. $950.00 - Contact John Leonard 903-592-6009. FOR SALE - Nearly new JET Mini lathe with new stand (still in box), drive center, live center, faceplate, and knockout bar. $250.00 Contact John Leonard 903-592-6009.

Invitation from The Arizona Woodturners Association

The Arizona Woodturners Association will have a regional symposium

"Desert Woodturning Roundup" next February 18th and 19th 2006 in Mesa, Arizona.

See the following web site for a list of world class demonstrators and for registration information. All turners are welcome.

www.desertwoodturningroundup.com

Thanks

Sean Troy – President Arizona Woodturners Association 480-732-9103

9:00 a.m. to 7:00 p.m. 9:00 a.m. to 9:00 p.m. 9:00 a.m. to 6:00 p.m. 11:00 a.m. to 5:00 p.m.

Store Hours

Monday – Friday Thursday Saturday Sunday

1430 Marsh Lane – Addison, TX 75001 (972) 241-0701

Delta Crown Vega

Powermatic Nova

One-Way

Jet Sorby

Tormek

Helping You Make Wood Work

WOODCRAFT

mailto:[email protected]:[email protected]:[email protected]://www.desertwoodturningroundup.com

SHIRT ORDERS

Anyone who would like to order a club shirt to have for the SWAT in Sep/Oct can place your order with Marjorie at the August meeting. For those of you who have placed your order but have not received your shirt yet, it is because she must have a minimum of 8-10 shirts before placing an order. Now is the time to place that order so that we can all have a club shirt to wear at SWAT.

July Meeting

Demonstration

Grinder Wheel Evaluation For Sharpening

as posted on www.woodcentral.com by bill tindall [email protected]

This discussion will focus on using the bench grinder for sharpening, where a small amount of metal must be removed to

establish a wire edge prior to edge refinement by honing. An in depth discussion of grinder wheels has recently been posted in the Articles section and only the highlights will be repeated in this study of 3 different wheels.

Summary- Use the right wheel and burning is not a problem. Background When sharpening a dull edge enough metal must be removed to establish a wire edge. The appearance of the wire

edge ensures that all of the worn edge has been removed. This step can involve removing a significant amount of metal, a slow process on a bench stone. To speed this process woodworkers have considered the advantages of a "power assist" in the form of some sort of sharpening machine. The versatile, and inexpensive, bench grinder may not be considered for this task for fear that it will heat the edge and destroy its hardness. I will show that with proper wheel selection, the bench grinder is both a quick and inexpensive way to use power assisted sharpening without fear of overheating.

The act of grinding generates heat which, if not removed from the tool, will heat the edge and soften it. Softening can occur at temperatures as low as 400 F depending on the steel, so heating during grinding is a serious concern. If the abrasive particle contacting the steel is sharp, a metal shaving is milled from the steel and ejected. A significant amount of the generated heat will be removed in this shower of red sparks. A dull grit ploughs across the steel and transfers much of the heat to the steel. So the "secret" to cool grinding is to renew sharp grit particles at the grinding wheel surface.

Two factors determine the sharpness of the particle during grinding. "Particle friability" is the particle's tendency to fracture under grinding pressure. The abrasive particle can be designed to fracture under the particular pressure used for grinding, heavy pressure for heavy material removal and light pressure for sharpening. As the particle edges break off, new sharp edges are exposed. Obviously, this process can not go on forever because the particle grows smaller as its edges break off. The bond holding the particles together can be designed to slowly fail under the pressure used in grinding and thereby slowly release the dull particles from the wheel surface. As these dull particles erode away, fresh sharp particles are exposed. "Bond hardness" is used to describe this wheel property. It is designated by a letter grade, G or H for a very soft bond, to N for a very hard bond typical of the gray wheels that come with bench grinders. It follows that particle friability and bond hardness BOTH must be tailored to the grinding pressure conditions expected as well as the hardness of the metal being ground. Heavy material removal, such as tool shaping, require a less friable particle than light pressure grinding such as would be used for sharpening and hard metals require a softer bond.

The typical wheel sold for bench grinders is optimized for heavy pressure grinding and soft steel. When such a hard, less friable wheel is used for sharpening at light pressure the surface particles dull, the wheel loads up with metal dust and vast amounts of heat are soon generated. It is little wonder that many people have concluded that bench grinders are inappropriate for sharpening.

The appropriate abrasive particle as well as the optimum bond- both must be considered for sharpening- are available in wheels used in surface grinder machines. Unfortunately, none of the woodworking sources have stocked such wheels sized for bench grinders. Many places stock "white wheels" which have abrasive of the proper friability, but the bond in these wheels is too hard for sharpening tool steels(see test results below). Perhaps as customers become knowledgeable about what is best, woodworking sources will begin to stock appropriate wheels. Indeed one source has already pursued this opportunity.

I recently posted some favorable results for grinder-sharpening using a surface grinding wheel from Radiac. Joel, Tools for

http://www.woodcentral.commailto:[email protected]

Working Wood, suggested an alternative wheel that he and the folks at Norton were developing. Joel arranged for me to try this Norton 3X wheel.

The test Three wheels were used in this test, all 7", 80 grit, on a 3600 rpm grinder. 1. Norton 3X , bond hardness I. This wheel is 30% Norton SG aluminium oxide particles and the remainder white aluminium

oxide, probably 9A. The combination is friable. The SG component is expensive to make, and long lived while maintaining sharp edges, and the bond is somewhat soft. 2. Norton White 9A, bond hardness J. This abrasive is very friable but the bond is fairly hard. 3. Radiac RAA abrasive, bond hardness H. This abrasive is very friable and the bond is quite soft. Radiac claims it is nearly equivalent to Norton 25A abrasive. It is pink from chromium and pink is a different abrasive than red or ruby which is not very friable. Chromium is supposed to make this abrasive better for abrasion resistant steels, eg A2 and CPM 3V.

A thin A2, a thick O1 and a very thick CPM 3V plane iron and a 3/8" CPM 3V bench chisel were sharpened with these wheels. The bevel angle was 28 degrees and grinding extended to the cutting edge of the tool. It could be said that this was a "cutting edge grinding evaluation. (Groan!) Grinding technique was "touch and go", that is while moving the tool from left to right and right to left it was contacted with the wheel as it moved past the wheel surface. On purpose considerably more metal was removed than would have been the case with normal sharpening. This grinding provided a severe test of edge heating, especially with the thin plane iron and small chisel, which provided little mass for heat removal.

Results The 9A wheel with its hard bond quickly loaded up with metal, the surface dulled and I could not control burning. This test illustrates that a friable grit is insufficient. It must be combined with a soft bond to be cool running.

No evidence of burning was encountered with the other wheels. Only the wire edge was discolored, which is unimportant. The Radiac wheel cut a bit faster which may not be an advantage if fine control of grinding is important. The softer bond of the Radiac wheel shed particles in use. In my experience the Radiac wheel sheds particles at such a rate that wheel dressing is never necessary, but shed particles can be a housekeeping issue, especially if they land on a board to be planed. The Norton 3X wheel slightly loaded with metal after some use. It might eventually be necessary to dress it, but maybe not. It shed particles much less than the Radiac wheel (because of harder bond). The finish from each wheel was the same as best I could tell. A few honing strokes on 15 micron diamond removed the grinder scratches in either case .

Conclusions Either the Norton 3X or the Radiac RAA wheel can be used to sharpen edges without burning, at least under the conditions tested. It is expected that a Norton 25A in a soft bond would be equivalent in cool grinding. A 9A or equivalent might also be just fine in a soft bond, say G or H. It is my impression that the Norton 3X wheel is in beta testing and will soon be available in a variety of sizes and grits at places where Norton wheels are sold. The Norton 25A and 9A may be had at tool places that sell to metal shops, eg MSC, but it can be problematic getting the wheel in sizes best for bench grinders. The Radiac wheel must be custom ordered from Radiac. Our club recently ordered a batch of custom sized Radiac wheels, which solves the minimum order size problem for custom wheels.

Because these wheels provide a cheap alternative to sharpening machines, some costing hundreds of dollars, there is a fine marketing opportunity on the table for someone to stock wheels of optimum grit composition and wheel bond hardness in bench grinder sizes.

Mentor List

Tom Criswell 509-1042 Tyler [email protected] Tom Crosby 567-4701 Canton [email protected] Norm Dixon 753-6980 Longview [email protected] Steve Green 489-1507 Athens [email protected] Ed Heuslein 834-3838 Kilgore/Overton [email protected]

John Leonard 592-6009 Tyler/New Harmony/Lindale [email protected] Lynn Pratt 581-0769 Noonday/Flint [email protected] Ken Terrell 839-4735 Whitehouse [email protected] Mike Taylor 723-8125 Palestine [email protected]