The Correct Way To Sharpen Drill Bits Using A Picador Drill Sharpening Jig With Custom Base

[Clive Brown 1Participant @clivebrown1]

I very occasionally use the side of my grinding wheels although I can fully see why the practice is frowned upon on safety grounds. But irrespective of this, surely a practical problem with regular use of the side of a wheel is the difficulty of regular dressing to maintain shape and cutting efficiency. Setting up a jig to routinely use the side of the wheel will run into this difficulty. Isn't this the type of job that cup wheels were invented for? They're all side!

[Richard Kent 1Participant @richardkent1]

Posted by Clive Brown 1 on 02/06/2022 16:51:26:

I very occasionally use the side of my grinding wheels although I can fully see why the practice is frowned upon on safety grounds. But irrespective of this, surely a practical problem with regular use of the side of a wheel is the difficulty of regular dressing to maintain shape and cutting efficiency. Setting up a jig to routinely use the side of the wheel will run into this difficulty. Isn't this the type of job that cup wheels were invented for? They're all side!

Clive Brown 1 – Hi Clive, I was just showing it was possible to do with a standard bench grinder by following the Picador instructions.

This is NOT engineering advice so do not UNDER ANY CIRCUMSTANCES follow what I do

[blowlampParticipant @blowlamp]

I must say I've never really understood the advice to not use the side of an abrasive wheel. It seems contradictory when you see some of the very fragile looking cup & saucer wheels that are made and intended for this very purpose.

Martin.

[Nicholas FarrParticipant @nicholasfarr14254]

Hi Richard, if you wish to ignore established safety advice, that's up to you, providing no one else is involved while you are doing it. I can only give advice on what I've been trained and used in industry all my working life and the abrasive wheel courses that I've been on.

Regards Nick.

[Richard Kent 1Participant @richardkent1]

Nicholas Farr – Nick, see my disclaimer below…………….

This is NOT engineering advice so do not UNDER ANY CIRCUMSTANCES follow what I do

[Mark RandParticipant @markrand96270]

Deleted:- replying to a post over a page ago!

Edited By Mark Rand on 02/06/2022 19:02:34

[JasonBModerator @jasonb]

I suppose one should take into account how long ago those old Picador instructions were printed. Things have moved on a lot since then regarding health and safety, users should do too.

The reason it is suggested not to use the side is that after prolonged use the outer edge will become undercut and likely to break away due to the rotational forces, bonding anything onto the opposite side is unlikely to do anything to reduce these forces. The lack of any side enclosure to the wheel on the grinder shown will also increase the risk of injury should the wheel fail.

[Richard Kent 1Participant @richardkent1]

JasonB – Please see my disclaimer below……………

This is NOT engineering advice so do not UNDER ANY CIRCUMSTANCES follow what I do

Ignoring this warning could cause severe physical or psychological damage!

Edited By Richard Kent 1 on 02/06/2022 20:15:44

[Clive FosterParticipant @clivefoster55965]

In reality there is little risk of an originally good wheel becoming dangerously undercut.

These devices need a flat or near flat grinding surface to function.

Any significant hollowing will destroy the sharpening geometry leading to loss of clearance angle at the outer edges so "sharpening" the drill will make little difference to its cutting prowess. The larger the drill the sooner the effect occurs. Long before the wheel becomes dangerous the "(obscenity delated) useless sharpener thing" will have been binned, pitched into orbit or relegated to the darkest, most spider infested, corner at the back of the cupboard.

A barely noticeable hollowing of the side of the flat wheel I originally had on my grinder was sufficient to prevent proper sharpening of larger drills. Careful examination under magnification proved that there was no clearance at the outer ends of the cutting edges. I'd guess something significantly under 1/16" hollow would be enough to destroy all confidence.

I fitted a 3/8" (ish) wide straight cup wheel and wide table perpendicular to the spindle, Hemingway Worden style., to my inexpensive Whitecolt grinder. Which made it far nicer to use for tool sharpening duties. The better visibility made it clear that the actual cutting circle travels sideways across the wheel as the Picador device swings. With 20/20 hindsight my cup wheel was barely wide enough to manage 1/2" drills. Had to do a bit of careful shuffling of pivot mount position to get it all working well.

I suspect the Picador vertical pivot, 5 to 5 edge position, style has a rather greater shift of the cutting point during the swing than the alternative angled pivot, vertical edge position, style. Making it considerably more sensitive to wheel hollowing. But the Picador grind geometry is much more reliable over a range of drill sizes.

Clive

[VicParticipant @vic]

I’ve got a belt grinder so I was thinking of trying this.

https://youtu.be/TExcJjkmRfo

[Martin KyteParticipant @martinkyte99762]

Our Lab workshop wheels are dressed to a taper on the side of the wheel for probably a couple of inches which not only addresses the issue of undercutting but generates a surface that runs true. The fact that the surface is slightly conical in form matter very little.

regards Martin

[Richard Kent 1Participant @richardkent1]

Martin Kyte – Perhaps look at the grinding wheels from ………………

 

 

Edited By JasonB on 05/06/2022 18:40:29

[JasonBModerator @jasonb]

Richard do you have any ties with ……………. you plug them several times and even offer a discount code.

Your reply above is nothing more than promoting a make and I can't see any reason why that is applicable to Martin's post.

 

Edited By JasonB on 05/06/2022 18:40:48

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Michael Gilligan on 01/06/2022 23:11:15:

.

Edit: __ You may [or may not] be interested to read the current H.S.E. Guidance, which I linked in this recent thread:

**LINK**

My post timestamped : 20/03/2022 08:27:45

.

Repeated for emphasis ^^^

It is particularly worth noting that the term “off-hand’ is used in the HSE paragraph that I showed.

Use of the Picador jig as per the cautionary instruction, does not constitute off-hand grinding.

MichaelG.

[JasonBModerator @jasonb]

Don't they say "a wheel used for offhand grinding"

Highly likely that most hobby users will leave the same wheel on the machine to use both the jig and offhand grind other items.

[Richard Kent 1Participant @richardkent1]

Posted by JasonB on 03/06/2022 06:51:00:

Richard do you have any ties with …………. you plug them several times and even offer a discount code.

Your reply above is nothing more than promoting a make and I can't see any reason why that is applicable to Martin's post.

 

 

JasonB – Hi Jason, I think you are reading too much into that

I have this vision you that you have a rule book in one hand and a cane in the other and you are ready to dish out punishment anytime
 

Edited By Richard Kent 1 on 03/06/2022 08:38:01

Edited By JasonB on 05/06/2022 18:41:17

[JasonBModerator @jasonb]

We do have a rule about commercial posts, can you answer my question.

[Richard Kent 1Participant @richardkent1]

Posted by JasonB on 03/06/2022 08:38:40:

We do have a rule about commercial posts, can you answer my question.

Definitely not and I have enough money to not have to be motivated by a 10% voucher

 

Suggestion: If you think that link and discount code is there for any other purpose than to help someone then you are welcome to remove that information.

Edited By Richard Kent 1 on 03/06/2022 08:51:55

[JasonBModerator @jasonb]

I will discuss with the other moderators it is just such a specific discount code which is usually associated with a person getting some reward for any purchases made by others using that code. And as I said your reply to Martin was nothing more than promoting that brand and nothing related to his post.

The letters of the discount code would seem to relate to your e-mail address and you, then the 010 for 10%. Also a business e-mail being used.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by JasonB on 03/06/2022 07:27:15:

Don't they say "a wheel used for offhand grinding"

Highly likely that most hobby users will leave the same wheel on the machine to use both the jig and offhand grind other items.

.

That does nothing to contradict the guidance

MichaelG.

[Richard Kent 1Participant @richardkent1]

Posted by JasonB on 03/06/2022 08:57:58:

I will discuss with the other moderators it is just such a specific discount code which is usually associated with a person getting some reward for any purchases made by others using that code. And as I said your reply to Martin was nothing more than promoting that brand and nothing related to his post.

The letters of the discount code would seem to relate to your e-mail address and you, then the 010 for 10%. Also a business e-mail being used.

 

@JasonB – I repeat my original suggestion: If you think that link and discount code is there for any other purpose than to help someone then you are welcome to remove that information. No offence intended or taken.

 

Edited By Richard Kent 1 on 03/06/2022 09:37:27

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