Ebay Boring bar - Good deal or waste of money?

[precisionworks]

point me to the required, high quality R8 spindle shell holder

Always happy to help spend your money
Call Tom Johnson and tell him you want Bison-TMX part number HK30065010 at $56.50 + shipping. That's the R8 shell mill arbor with .750" diameter shank (double check to make sure that's the correct bore for your shell mill - other sizes are available from Bison TMX)

(248) 442-9482

I just spoke with Tom & he is waiting for your call

[precisionworks]

Is this the part number - RF00300S100SD43C - for the 3" face mill?

If so, bore is 1"

[wquiles]

Originally Posted by precisionworks

Is this the part number - RF00300S100SD43C - for the 3" face mill?

If so, bore is 1"

I went ahead and ordered the 3" 45Deg shell from Glacern Machine Tools:
link ...

and it does use/need a 1" bore.

For inserts, I wend with the Korboloy SEHT43 Grade X83 - Uncoated, polished, and ground inserts. Once I add the price of the shell and inserts, it was similar to the combined special on Grainger, but I got to pick the inserts I wanted.

Will

[wquiles]

Originally Posted by precisionworks

Always happy to help spend your money
Call Tom Johnson and tell him you want Bison-TMX part number HK30065010 at $56.50 + shipping. That's the R8 shell mill arbor with .750" diameter shank (double check to make sure that's the correct bore for your shell mill - other sizes are available from Bison TMX)

(248) 442-9482

I just spoke with Tom & he is waiting for your call

As I don't take your advice lightly, I went and call him just now. Funny thing, we even talked a little in Spanish (my native tongue, as I am from Puerto Rico).

I sent him an email with all of the information, so he will be processing my order soon, as well as creating an account for me - I suspect this will not be the last time I talk to Tom

Will

[PEU]

Entonces no es Tom... es Tomas

(then its not Tom... is Tomas)


Pablo

[wquiles]

Originally Posted by PEU

Entonces no es Tom... es Tomas

(then its not Tom... is Tomas)


Pablo

Exactamente. El se acordaba un poco del Espanol que aprendio en su escuela superior.

(Yup. He happen to remember some of the Spanish he learned while in high school)

Will

[wquiles]

Originally Posted by PEU

Entonces no es Tom... es Tomas

(then its not Tom... is Tomas)


Pablo

By the way, thanks for the link to the specials by "glacern"

Will

[precisionworks]

In Mexico, the most important word I learned was Negra Modelo

http://www.negramodelo.com/w/



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For inserts, I went with the Korboloy SEHT43

You may also want to call Vic at Rani Tool. He is closing out three or four grades in that shape, from Tyson Tool, and the price is outstanding. $3.99 uncoated, $4.99 coated.

Tyson clearance sheet:
http://www.tysontool.com/ClearanceItems071509.pdf

Rani Tool eBay store:
http://stores.ebay.com/Discount-CNC-Cutting-Tools

[wquiles]

Here in Mexico City, I prefer Agavero or Anis, after a good meal, and if we are celebrating a good deal with a customer, then we will also have some Tequila (Tradicional helada) at the beginning of the meal

Will

[precisionworks]

ordered the 3" 45 Deg shell from Glacern

That's a good looking tool at a great price. You will be amazed at how it performs.

went with the Korboloy SEHT43 Grade X83

Their website says "These high-positive inserts feature razor sharp edges for maximum productivity in stainless steel, aluminum and other non-ferrous alloys."

You'll also want to have a box of general purpose inserts, perhaps something with an AlTiN or other coating, as these don't have the high-positive edge shape, nor the razor sharp edge prep. The less sharp edge and tougher substrate are a better choice for steel or cast iron. Glacern shows these as the Kenna SEHW43 Grade K2885, and says "General purpose grade, excellent for both roughing and finishing of steels and cast iron. Cemented carbide substrate is wear and impact resistant." The equivalent grade from Valenite is V05, and Sandvik calls it a GC-3015.

found a 2" diameter shell end mill kit that uses the same APKT/APPT insert, but with 5 inserts to spread the cutting load

The brown truck delivered that yesterday, and I got a few minutes of spindle time around 11:30 last evening. Ran it at the same sfpm as the 45 deg mill head & it does a nice job. Not as free cutting as the high shear mill, no surprise there, so the feed has to be slower. But it leaves a near mirror finish & cuts a square shoulder, so it's a good addition to the tool kit.

I suspect this will not be the last time I talk to Tom

He's a good guy, able to get lots of top end tooling & doesn't feel the need to mark the price up beyond reason. The same shell mill arbor that he sold for $56.50 was offered to me for $79.95 by another seller. And his shipping charges are low, $5 or $6 instead of $10-$12 from MSC, Grainger or McMaster. I needed to replace a 3/4" and a 1" S&D drill bit, and Tom got both of those through Titan Tool. Very nice quality, every bit as good as Precision Twist, but not quite as much money. Ask him to send a Titan Tool catalog.

[wquiles]

Got the 3" cutter today - it is HUGE!





Here it is compared to my Iscar 1.5" face mill cutter:





The matching R8 arbor should hopefully arrive this week

[precisionworks]

A nice addition to the stable ... from Rani Tool, their "house brand" AP90-1500-R8, which is a 90 degree, 1.500" end mill, using APHT-1604 inserts. These are ground sharp, like little razors. Smooth cutting for a small diameter end mill.



Also, a Lyndex ER-40 collet nut with ball bearing. Best thing I've ever done for the ER-40 collet chuck. Available for other ER sized collet chucks.

[wquiles]

Originally Posted by precisionworks

Also, a Lyndex ER-40 collet nut with ball bearing. Best thing I've ever done for the ER-40 collet chuck. Available for other ER sized collet chucks.

I also use an ER-40 collet. What does the ball bearing part do different for you?

[precisionworks]

What does the ball bearing part do different

If you analyze any collet chuck, the outside "rear" taper of the collet is being pushed into the matching internal chuck taper. As the nut is tightened,there is increasing pressure on the front face of the collet as pressure is transmitted through the front face to the rear taper. Without a ball bearing, there is tremendous metal on metal pressure as the nut is turned but the collet remains stationary. The ball bearing allows much easier rotation of the nut.

The studies I've seen state that better collet concentricity is achieved with the BB nut. Greater clamping pressure is a second benefit. Here are some good reads on collets:

http://www.rego-fix.com/colletcare/

http://www.mmsonline.com/articles/th...of-runout.aspx

[wquiles]

Originally Posted by precisionworks

If you analyze any collet chuck, the outside "rear" taper of the collet is being pushed into the matching internal chuck taper. As the nut is tightened,there is increasing pressure on the front face of the collet as pressure is transmitted through the front face to the rear taper. Without a ball bearing, there is tremendous metal on metal pressure as the nut is turned but the collet remains stationary. The ball bearing allows much easier rotation of the nut.

The studies I've seen state that better collet concentricity is achieved with the BB nut. Greater clamping pressure is a second benefit. Here are some good reads on collets:

http://www.rego-fix.com/colletcare/

http://www.mmsonline.com/articles/th...of-runout.aspx

Gotcha. Convinced. Where do I get mine from?

[precisionworks]

The Lyndex BB nut came from Vic at Rani Tool. $40 (I think )

[wquiles]

The Bison shell R8 arbor that I ordered from Tom arrived today: