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Old 12-19-2016, 11:56 PM   #51
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Yes can do ,will be when next in the shed.Have guests for Xmas so may be in a few days


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Old 01-09-2017, 05:17 AM   #52
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Well Xmas and new year over,family gone home and after a few days of 40o c
today I managed a couple of hours in the shed.I have ordered lots of smaller
cheaper items from China which have started to arrive.
The ER32 collets are ok for the larger drills and end mills but a bit larger for the smaller stuff.I purchased a 12 piece set of ER16 collets and a couple of nuts for $30 and have on order a ER16 collet chuck and nut with 16dia x 100mm lg spindle for $15.This can be used in the mill gripped in the
R8 x 16mm collet which will give me more reach/clearance for small mills/drills
I also made a 40mm sq /Er16 collet block to use in the acute system
I made it 40mm sq for now to fit the existing housing.Later if need be I machine it down to suit to the pantograph


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Old 01-10-2017, 01:35 AM   #53
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Default Photos of diamond wheels

Photos for Pat of the diamond cup wheels ave $15 each and adequate for the job.Im still playing with the the overall setup regards heights and locations of the unit and table prior to making a dedicated stand.At the moment I am concentrating
on drill sharpening and I am not happy with the current setup
The 40mm collet blocks raises the drill too high above the table and although the current setup may work well for end mills its too involved for simple drill sharpening.Will go back to the basic table and redesign a simple fixture for drills.The 40mm sq collet block is too large for the smaller drills so will reduce size with a more simple fixture at nom 30o (near enough to give me 118/120o
angle
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Old 01-10-2017, 02:21 AM   #54
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Mate how did you take a pic tomorrow?

reckon you could give me a pic of tomorrows lotto numbers?

Tom R
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Old 01-10-2017, 05:45 AM   #55
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Never noticed that,depends on which side of the international date line you live
I will tell you the nos ,can you buy the tickets
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Old 01-10-2017, 09:55 AM   #56
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Quote:
Originally Posted by bazmak View Post
Never noticed that,depends on which side of the international date line you live


I've just sold a date palm. My late wife planted it in the septic tank. It seemed quite happy. We were getting our own back



life's a lottery, I suppose

N
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Old 01-10-2017, 10:03 AM   #57
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On a more serious note, I'm wondering about this ER16 thing and doing small drills. To date( not that again), I never have been able to recover small drills. I'm a bit confused( normal for me) about the grit size.

I've been using the CBN wheel - with 160 grit and no way am I getting satisfactory results below- say 6mm.

Comments will be appreciated

Norm
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Old 01-10-2017, 11:27 AM   #58
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I would use a much finer grit as very little matl needs to be removed
I also plan to use a single facet grind,havent decided on the angle yet
Still to played about with.If my memory serves me when I used to hand grind
twist drills years ago and I was quite good anything above 5mm was lightly ground by eye and then the back relieved (2nd Facet) As the drills got smaller
then a single facet between say 5 and 15 o was ground and below 2mm it
was more luck than good judgement.I have lots of playing to do just for fun
will keep you informed.Meanwhile I have just purchaced a few quality drills
from 3 to 8mm as test pieces
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Old 01-10-2017, 01:49 PM   #59
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Norman,

As Baz has stated, if you are just resharpening, then grit sizes need to be rather small to obtain decent results.

I have been using diamond wheels for a few years, and my roughest is 1200 grit, in both wheels and laps.

More depends on the direction of cut (grind), it is best if the grind is at right angles to the cutting face, especially if grinding or lapping tungsten, go across the cutting face and the edge is very liable to chip away in quick order.

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Old 01-10-2017, 04:55 PM   #60
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Hi Baz,

In order to get the drill cutting edge and any facets exactly in the right place the tip of the drill should fall on the centre line of the wheel face and the point at which the drill is pivoted to create the primary and secondary facets.

The pictures might help explaining what I'm getting at. However if you are only bothering doing a conical grind then treat this as for information only.

Click image for larger version

Name:	Drill Grinder Geometry.jpg
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ID:	86425

Click image for larger version

Name:	Figure-1.jpg
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ID:	86426

I've just noticed that the word "Table" in the picture should say "Drill". These are from my notes when making John Moran's 4 - 6 Facet Drill Sharpener.


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Last edited by BaronJ; 01-11-2017 at 01:13 PM. Reason: Word "Table" replace by Drill
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