Boyer Schultz 6-12 Surface Grinder

Boyer Schultz 6-12 Surface Grinder

Owner/Loaner	PS1
Serial Number	{{{serial}}}
Make/Model	6-12
Arrival Date	May 2018
Usability	yes
Contact	Host Cold Metals
Where	{{{where}}}
Authorization Needed	yes
Hackable	no
Estimated Value	$400
Host Area	Cold Metals

Documentation

Specifications

Wheel diameter	7"
Wheel thickness range	3/16" to 1/2"
Wheel hole diameter	1 1/4"

Grinding Wheel Types

Grain Size/Grit

Grit class	Coarser	<-	--	--	--	->	Finer
Coarse	8	10	12	14	18	20	24
Medium	30	36		46		54	60
Fine	80	100	120		150		180

Grade

Grade class	Softer	<-	--	--	->	Harder
Soft	B	D	E	F	G	H
Medium	I	J	K	L	M	N
Hard	O	P	Q	R	S	T

Bond

Bond type	Symbol
Vitrified	V
Resin	B
Resin bonded	B2
Reinforced resin	BF

Grain Types

Type / Composition	Symbol	Usage
Dark Aluminum Oxide	A	Most common grain. Used for Heavy Duty General Purpose
20% Ceramic Aluminum Oxide, 30% Pink Grain, 50% White Grain	AS3	Excellent for form and corner holding.
Blue Aluminum Oxide	AZ	Grinds fast with excellent cool cutting action and requires minimal dressing.
Red Aluminum Oxide (Ruby)	RA	Harder grain and sharper than PA & AZ wheels good for steels with high level chromium
Pink Aluminum Oxide	PA	General Purpose Grain that is tough but friable. Tool Room sharpening applications.
White Aluminum Oxide	WA	Highly friable grain for fast cool cutting. Good for light grinding on all steels particularly on tool and die steels.
Green Silicon Carbide	GC	Very friable use for carbide grinding applications.

Tools

Adaptor - https://www.mcmaster.com/#43745a21/=1d6or75 
Puller  - https://www.mcmaster.com/#43745a51/=1d6osq6

Auth/Use Notes

Danger Committee: Jim Brink & McTavish McArdle

Authorization info

1. What you can do with a surface grinder
   • "How to grind fast and accurate"
2. Safety
   • Operation
     • The magnetic chuck should never be turned off when the wheel is spinning: if, for some reason, the wheel comes in contact with a part when the chuck is off, it could kick it out, possibly hitting something or someone (at best), or causing a wheel explosion
     • The spindle should never be turned on unless the wheel cover is fitted into place: if the wheel explodes when the cover is not fitted, nothing will protect you from the fragments
     • It is recommended that the X-axis stops are located such that they will stop the table before its horizontal travel is exceeded, and that the stop plunger is enabled when grinding
       • If the table exceeds its horizontal travel, it will hop off its ways, which can potentially cause a wheel crash
   • Work holding
     • Preparation
       • Stone parts & workholding fixtures (e.g. the magnetic chuck, a grinding vice) every time the setup is changed (e.g. when a part is removed from the magnetic chuck for measuring)
       • Wipe mating surfaces (e.g. part face, magnetic chuck face) down to remove grit before clamping
       • Lap or sand rough (unground) faces before holding them on the magnetic chuck
         • Magnetic holding force is a function of the surface finish of the mating faces (part face & magnetic chuck face)
     • Geometry
       • Thin parts
         • The field lines loop back about a quarter of an inch above the magnetic chuck face, so care should be taken that parts thinner than that are held securely: make sure they can't be shifted on the mag chuck before grinding
       • Tall parts
         • Work holding force is proportional to the contact area
         • Tall parts act as a long lever when the grinding forces (tangential to the wheel, parallel to the grinder travel) act on the top
         • Tall parts are prone to tipping over
           • They can be blocked in with shorter, wider pieces, but a safer route is to clamp them securely to something that isn't at risk of falling over: either in a grinding vice or to a large square
       • Everything on the magnetic chuck face should be oriented so that if it does tip over, the part is moved away from the grinding wheel, not into it; otherwise, it will likely result in a catastrophic crash (a wheel explosion) if the part tipswhile grinding
     • Material
       • Only ferromagnetic materials can be held directly on the magnetic chuck
       • Parts made of any other material need to be held using additional workholding fixtures (e.g. a grinding vice) which are themselves held by the magnetic chuck
   • Health
     • Dust / grit collection should always be turned on, because you do not want to breathe it
     • The operator should never put their hand (or any other body part) anywhere near the wheel when it's spinning
       • Even if the wheel is backed off from the magnetic chuck, the wheel should be turned off before parts are picked up off of the magnetic chuck, in case one of the hand-feed wheels is bumped, potentially causing the table to knock a body part into the spinning wheel
3. Parts and controls and spare parts
   • On/off -
   • Dust / grit collection
   • Axes
     • Table travel
       • X: the horizontal, left/right table travel
         • Stops on the X-axis travel
       • Z: the forward/backward table travel
     • Y: the vertical spindle travel
   • Magnetic chuck
4. Grinding wheel
   • ID, Grit,hardness, composition
     • Fundamentals
     • Finish
   • Dressing
   • Arbors
     • Removing wheel from arbor
     • Mounting on adapter
     • Balancing
5. Grind a surface
   • Square a part

References

Manual -> https://wiki.pumpingstationone.org/images/Boyer_Schultz.pdf

Suburban Tool Videos;

Grinding Wheel fundamentals -> https://www.youtube.com/watch?v=MofRhM_W-Vk
Grinding Wheel and finish -> https://www.youtube.com/watch?v=gjz0Zt76GJ4
Basic Surface Grinding -> https://www.youtube.com/watch?v=7FwL55ErfDI
Grinding a square -> https://www.youtube.com/watch?v=iMHksf17oqE 
Grinding Flat -> https://www.youtube.com/watch?v=CsTbWAu0k-o
Background info -> https://www.youtube.com/watch?v=jtB_jtH__F0

List of Currently Authorized Users

Qualified Member	Trained By	Date Trained