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Gallery, Projects and General => Project Logs => Topic started by: Meldonmech on February 25, 2014, 06:23:01 AM

Title: Bench Grinder Tool Rests
Post by: Meldonmech on February 25, 2014, 06:23:01 AM

Hi Guys
             For some time now I have been meaning to replace the inadequate tool rests on my Bench Grinder,  but other more interesting or urgent projects seem to have taken priority. I have been looking for a new short project which would give me more casting experience, and tool rests looked as they were particularly suitable.  I did a few sketches and made the wooden patterns.

Title: Re: Bench Grinder Tool Rests
Post by: rick barnes on February 25, 2014, 06:24:43 AM

I'm in need of a tool rest also and would love to see your sketches.

Title: Re: Bench Grinder Tool Rests
Post by: Meldonmech on February 25, 2014, 06:42:07 AM

 Hi Rick
            I made some castings for a Base, a table and a protractor. The base and the table had shrinking problems, and the protractor mould collapsed when the pattern was removed.

Title: Re: Bench Grinder Tool Rests
Post by: Meldonmech on February 25, 2014, 06:52:00 AM

   The patterns for the base and table were modified to ensure there was no great change of section. The protractor casting was machined to form new pattern having more taper.

Title: Re: Bench Grinder Tool Rests
Post by: Meldonmech on February 25, 2014, 07:00:34 AM

 
    The components were recast cast using the modified castings and turned out good, problems solved.


                                                                 Cheers David

Title: Re: Bench Grinder Tool Rests
Post by: rick barnes on February 25, 2014, 08:07:09 AM

I really need to learn to cast. Looks good.

Title: Re: Bench Grinder Tool Rests
Post by: Fredbare on February 25, 2014, 03:52:42 PM

I shall be watching this one David, looks very interesting, thanks for sharing.

John

Title: Re: Bench Grinder Tool Rests
Post by: Meldonmech on February 26, 2014, 03:34:23 AM

Hi Guys

             I decided to machine one base and table as far as possible on the lathe. The clamps are made off oak and perfectly adequate, and they don't mark the workpiece.

Title: Re: Bench Grinder Tool Rests
Post by: Meldonmech on February 26, 2014, 03:43:16 AM

  The next base and table I machined on the mill.  The channel for the sliding protractor was also machined at this stage.

Title: Re: Bench Grinder Tool Rests
Post by: Meldonmech on February 26, 2014, 03:58:23 AM

  The protractor casting was setup level in the milling vice and machined flat using a fly cutter.
 
  The casting was set up on the rotary table and the chamfer machined.

   The clamping slot was then cut.

Title: Re: Bench Grinder Tool Rests
Post by: Meldonmech on February 26, 2014, 04:19:48 AM

  I have not shown the machining of the  remaining parts as they are basic operations. For each rest two hinge links are required, which are held by coach bolts, star anti slip washers prevent rotation when clamped. Screwed handles are turned on the lathe. The brass clamping handles, and sliding steel strips for the protractor were made up.
      A steel plate was made to slot around the abrasive wheel, and prevent wear on the aluminium table, which is held by two c'sink screws.
       The final pic. shows a round nose tool being ground, which can be rotated in one continuous sweep.

                                                                            Cheers David

Title: Re: Bench Grinder Tool Rests
Post by: Meldonmech on February 26, 2014, 02:23:49 PM

  Hi John,

                             Thanks for you comments.
                                                                               Cheers  David

Title: Re: Bench Grinder Tool Rests
Post by: awemawson on February 26, 2014, 03:01:04 PM

 :thumbup: Good sturdy rests there David. Should make a huge difference to your tool grinding  :thumbup:

Title: Re: Bench Grinder Tool Rests
Post by: Fredbare on February 26, 2014, 05:01:21 PM

Well photographed David, nice job, thanks.

John

Title: Re: Bench Grinder Tool Rests
Post by: krv3000 on February 27, 2014, 04:20:18 PM

well thort out and well dun