Clarkson Drill Grinding Attachment

This is a video about the Clarkson Drill Grinding attachment made by the Clarkson Company in England. I have produced the video because I couldn't find any video about the attachment and I wondered if I was using it correctly? Hopefully there are people on the internet who know more about it than I do? Please note at the end of the video there is some information about the device and a link to download the handbook if you are interested.
At the end of the video is a page explaining which wheel I am using. It is for the Christen drill grinder and is producing a great finish on my drills.
This is the link to the UK supplier www.midlandabrasives.com/produ... to whom I have no affiliations.
Many thanks for looking.

[@fuzzzeballs]

cant wait to plug mine in

[@fredscuttle4578]

Well I did eventuall find one. bit scabby and seized up. A good soaking and clean has brought it back, had to make a new handle but the chuck is good.
Now all I need is the manual. the Bedroom workshop download pages seems to be broken though.

[@dynoguy]

Thanks for that, just what i was looking for... Bought an old Mk1 earlier this week, but no attachments whatsoever, so i have to make up some bits to use it as original parts + fixtures are going for way too much money.

[@fredscuttle4578]

George, These Clarkson drill grinding jigs seem to be about as rare as hens teeth!! So like another subscriber to your channel the solution seems to be to build one. To me it looks like a modified Potts Jig that swings the drill bit across the wheel. The question is what is the angle between the spindle arm pivot and the center line of the tool holder (the drill to be sharpened) it appears that this angle sets the relief angle for the drill, but I might be wrong.

[@georgeheg1658]

Right, I think I was lucky to find the one I did, even though I had to make the chuck. OK so if you mount the jig on the table, the centre line of the drill is inclined 18 degrees from the horizontal surface of the table and 35 degrees from the front edge of the table. I tried these angles a couple of times so these are my best estimates. Don't forget that the table is pivoted by 15 degrees in actual use so that it doesn't foul on the grinding head, as per the Clarkson manual. Also the entire jig rotates about itself to allow grinding of different point angles. Have a look at the Clarkson manual and the pictures at the end of the video for more details. Hope this helps.

[@glynbrandon861]

George, I would be interested to know if you made the collet chuck and spindle from scratch, or did you buy a chuck off-the-shelf and modify/sleeve it to suit the bore of the unit.

[@georgeheg1658]

Hi Glyn, the original item came with a spindle and no 6 jaw chuck. Due to the price of 6-jaw chucks I went for an ER type chuck and made an adaptor plate to fit it to the original spindle and ER chuck.
Since then I have made another spindle out of aluminium for a smaller size ER collet, as I found the big ER collet cumbersome for smaller drills. Fortunately the spindle is protected from dust inside the body of the attachment and so grinding dust hasn't so far affected the fit of the aluminium spindle.

[@MrLukealbanese]

Don't you need to grind back relief behind the leading edge?

[@georgeheg1658]

The design of the grinding jig is such that it automatically puts the back relief on as the drill tip is ground. The back relief is 'generated' by a combination of the initial angle and the movement of the jig.

[@glynbrandon861]

Tried to download a copy of the manual from the bedroom-workshop site which you quoted; however it appears you need login details. Do you know the login password by any chance? I have tried emailing Steven Vine to ask him, but to no avail!

[@georgeheg1658]

Hi, sorry but I don't have a login it is a new requirement.
There is a note in the section "Notes 1" saying "Please email me for the login details for the manuals." so I guess it is just a matter of waiting for the reply?

[@crozwayne]

Get a Brierley drill grinder rather than one of these!

[@georgeheg1658]

Yes the Brierley is a great tool and is dedicated to sharpening drills. I'm not sure that comparing a dedicated tool like the Brierley to a tool and cutter grinderlike the Clarkson, which can do many jobs, and with this attachment can also sharpen drills is a good comparison. For example the Brierley can't sharpen milling cutters or lathe tools. But yes if you are only concerned with sharpening lots of drills and can afford a dedicated tool, then the Brierley is a good way to go.