Hybco 1100 Tap Grinder ?

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Chipper5783
Posts: 15
Joined: Tue Sep 27, 2011 6:14 pm
Location: Alberta, Canada

Hybco 1100 Tap Grinder ?

Post by Chipper5783 » Tue Mar 08, 2016 7:21 pm

Has anyone any experience using a tap grinder? Specifically, how multi-purpose is this? How well would it work for any other cylindrical tool grinding (reamers, end mills, drill bits, ...)?

Regards, David
David C. Lathes: Enterprise 1550, Smart & Brown 1024, Mills: Maho MH 600 x2, Cinci Toolmaster, Kasto hacksaw PSB 210, Grinders: Cinc#2 T&C, Ingar 618 SG all but the first came as projects, now they support an endless list of more projects. Good thing I have a day job!

Harold_V
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Joined: Fri Dec 20, 2002 11:02 pm
Location: Onalaska, WA USA

Re: Hybco 1100 Tap Grinder ?

Post by Harold_V » Wed Mar 09, 2016 2:19 am

In my opinion, not well at all. Taps are backed off in a totally different manner than the other tools you mentioned.

In regards to reamers, hand and chucking reamers have little in common, as they work in totally different ways. Hand reamers are tapered at the starting end, turning straight. Such reamers are sharpened using a tooth on the flute. The entire flute is a cutting edge, while chucking reamers are cylindrically ground (and straight, save for a couple tenths taper towards the shank), so they don't cut on the sides. The small chamfer you see at the end of a chucking reamer is the cutting edge, and it's not cylindrically ground, but backed off so only the cutting edge makes contact with the cut, with the periphery of the reamer dictating size and piloting the reamer in the generated hole, assuming the reamer is free to seek center and is not damaged.

End mills have a helical flute, so you must follow the helix when generating the primary grind. Tap grinders aren't capable of doing that.

I'm not convinced the geometry provided by a tap grinder would be proper for drills. Maybe someone else can provide an answer.

Harold
Wise people talk because they have something to say. Fools talk because they have to say something.

earlgo
Posts: 1492
Joined: Sat Jan 29, 2011 11:38 am
Location: NE Ohio

Re: Hybco 1100 Tap Grinder ?

Post by earlgo » Wed Mar 09, 2016 10:15 am

A Polychoke grinding fixture followed me home from an estate sale and it is intended for use on both drills and taps. I have used it very successfully on drills when I had the proper 5C collet. I have not used it on any taps because I have a bunch of new ones and I don't have any 5C collets that fit a tap shank that needed sharpening. This fixture only works on the end of the tool, not the side of the flutes.

The Poly-Choke grinding fixture manufacture was purchased by BMC Tool in Quakertown, PA, but I couldn't find their website today. There is a listing for BMC in Trumbauersvill, PA but no website is listed that I could find.
Here are their instructions on the use of the PC101. (Oh well, too big to be uploaded.)
But it looks like this.
PC101 User Manual cover.pdf
(139.44 KiB) Downloaded 203 times
--earlgo
Before you do anything, you must do something else first. - Washington's principle.

earlgo
Posts: 1492
Joined: Sat Jan 29, 2011 11:38 am
Location: NE Ohio

Re: Hybco 1100 Tap Grinder ?

Post by earlgo » Mon Feb 17, 2020 11:29 am

Attn: Acme-man and johnfreese:
The PC101 manual was sent to you this morning. Hope you find it useful.
--earlgo
Before you do anything, you must do something else first. - Washington's principle.

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