Universal Grinding Fixture

**rossbotics** · Feb 27, 2017, 04:42 PM

This tool was designed to hold Lathe bits, boring bars, and round tool bits for sharpening or resharpening with the aid of a surface grinder, carbide tipped tools can be sharpened as well with a diamond wheel, carbide inserts can be reground with the appropriate made fixture to hold the insert,

Tool bits can be sharpened with great accuracy with razor sharpness, with this fixture the tool bit is held rigidly, no guessing at angles, any angle can be set in seconds.

There are three pivot points in which this fixture rotates and swivels on, each of those rotating points has a graduated collar, each graduation on the collar represents 2°, ranging from 90-0-90, the reference marks were carefully aligned and engraved accurately according to the zero marks on the collars, the graduated collars were made on my Machine Tool Dial Making Fixture that I previously posted on Home Made Tools. Net

All parts were constructed from 4140 steel although mild steel would be suitable, everything was ground flat and parallel insuring everything pulled up square.

To use this tool is very easy, just set it on the magnetic chuck of a surface grinder and turn on the magnet, set any desired angle and grind, it is helpful to do a rough grind on a bench grinder as this will reduce the amount of grinding on the surface grinder, to do a rough grind by hand is easily done by the aid of a protractor.

Down below you will find some photos of the construction and completed tool
As always thanks for looking and happy machining

Doug

There is a complete set of cad drawings, detailed instructions, and multiple photos for this fixture, click the link below
http://www.homemadetools.net/forum/u...9360#post89149

Making the tool holder

Aligning the first graduation to be engraved with the two mounting holes in the Turret dial

Locating center

Aligning the first graduation to be engraved with the two mounting holes in the Pivot dial

Stamping the figures

Tool holder being held in a collet and taking a .003" cut on the O.D. to remove high spots, this was done to all three dials

All parts made and ready for assembly

Assembled fixture

Another view of the assembled fixture

Another view of the assembled fixture

Mounted on the grinder

Another angle

Another angle

There is a complete set of cad drawings, detailed instructions, and multiple photos for this fixture, click the link below
http://www.homemadetools.net/forum/u...9360#post89149

**DIYer** · Mar 1, 2017, 06:01 AM

Thanks rossbotics! We've added your Universal Grinding Fixture to our Grinding category,
as well as to your builder page: rossbotics's Homemade Tools. Your receipt:

Universal Grinding Fixture by rossbotics

tags: grinding, fixture

**Paul Jones** · Mar 1, 2017, 08:19 AM

Doug,

As always, your tool creations have excellent workmanship. The series of photos are very instructive. 4140 steel is a great material to machine after some experience picking the best cutting tools and speeds. Thank you for the tool posting (and looking forward to seeing your plans).

Regards,

Paul

**rctoywizard** · Mar 1, 2017, 07:10 PM

Originally Posted by rossbotics

This tool was designed to hold Lathe bits, boring bars, and round tool bits for sharpening or resharpening with the aid of a surface grinder, carbide tipped tools can be sharpened as well with a diamond wheel, carbide inserts can be reground with the appropriate made fixture to hold the insert

------------------------------------------
Very impressive! very nice job for sure. thank you

**Jon** · Mar 3, 2017, 11:00 AM

Congratulations rossbotics - your Universal Grinding Fixture is the Homemade Tool of the Week!

Once again a week with multiple nice builds that could've won had they been posted in a less abundant tool week. However, "less abundant tool weeks" are increasingly rare around here.

Some nice picks: an Adjustable Laser Cutter Platform by scorch, an Extra Wide Mini Excavator Bucket by Frank S, a Quasi-Involute V-Block by mklotz, an Easy Grip Center Punch by Philip Davies (this is a rising trend around here: tools that are easier to handle), a Hole Cutter by olderdan, and a 3D Measuring Technique by rgsparber (interestingly, note this Trigger Guard by rgsparber, posted yesterday, and like the measuring technique, also makes clever use of simple metal wire). And the $100 Craigslist 1935 South Bend Lathe Restoration by mr95gst was so nice that we're considering adding a new monthly award for the best tool restoration.

Very nice to see this tool made with a previous Homemade Tool of the Week winning tool by rossbotics, his Machine Tool Dial Making Fixture. Detailed plans are on the way for this fixture; I've just sent out the cover art to rossbotics for his approval. If the success of the Machine Tool Dial Making Fixture plans is any indicator, this will be a popular set of plans.

rossbotics - you'll be receiving a $25 online gift card, in your choice of Amazon, PayPal, Giftrocket, or bitcoin. Please PM me your current email address and gift card choice and I'll get it sent over right away.

That's win #13 for rossbotics! Here are all of your wins: