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Thread: Big brother drill grinder.
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25th Jan 2020, 01:51 PM #1Senior Member
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Big brother drill grinder.
SAM_0589.jpgSAM_0590.jpgOld goat is back.
A very well made drill grinding attachment originally with a Servian T & C grinder. Yes I do use recessed one side wheels if I have some drills to sharpen. All materials are of high standard and workmanship is tops. I would date it at 1980 or so. The pivot position and drill overhang is changeable depending on drill diameter. Two different locating plates for the front of the arm change the size range from 12-22mm to 22-40mm. More complex in the pivot design but can be copied in a work shop. Once the drills have gone thru this you can hog the material out.
Drilling is the most used operation and receives the least attention.
BC.
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25th Jan 2020, 06:34 PM #2Diamond Member
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That certainly looks to be a nice bit of kit, Was it manufactured by Servian, or just attached to one of their T&C grinders?
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26th Jan 2020, 12:07 PM #3Senior Member
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Big drill grinder
Hello to Ropetangler.
It was an attachment for the Servian. A very unusual machine tool. The head can tilt and swivel. It has provision for a strait wheel on the rear of the spindle. There is a table on the left of that fitted with a similar tool holder and pivot as a D bit grinder. The drill grinder slid into a socket on the right side and used the same wheel on the rear. It is a busy grinder. I don't know what it had as a workhead as that was missing.
BC
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26th Jan 2020, 09:12 PM #4Senior Member
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Just to assist a little with some photos of an AR5E grinder workhead and drill grinding attachment, without the adjusting tailstock installed. The machine is very versatile but one needs good eyesight to set up, as the graduated scales are quite small as well as access all around it to read them. Alan.
DSC00935.jpg DSC00936.jpg
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26th Jan 2020, 10:45 PM #5Diamond Member
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Thanks to BC and C47 Alan for filling in the gaps. As a matter of interest were those Servian machines made in Australia, or did they appear after Servian started sourcing machines from outside Australia. At a place of my previous employment, we had a very nice Servian 3 phase pillar drill with a geared head spindle and 3 downfeed settings. The whole unit was very nicely made with high quality castings, no pressed metal parts at all. For some time I searched online for one but the only possible sighting was 12 to 18 months ago. Unfortunately the photos were terrible, the machine was covered in crud, partially dismantled and sitting on a pallet, was in South Australia and the seller was asking around $2k if I recall. I may have been tempted if it had been in good nick, or much closer to me, preferably both, but in the end I didn't even make an enquiry. As I recall the drill my employer had would have been Australian made in the mid to late 60s. Cheers,
Rob.
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26th Jan 2020, 11:49 PM #6Senior Member
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Rob,
Not wishing to pre-empt Steamloco 1954 response, I believe, but could be wrong, these originated in Spain and were marketed under various names, Elite, Servian, Astra and probably more, but from what I've seen they are the same machine.
The adaptation by BC of the drill holding head to a larger wheeled grinder is very good and overcomes one of the limitations on the smaller wheel machines. Alan.
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27th Jan 2020, 09:49 AM #7Senior Member
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Big drill grinder
Hello C-47.
At last more info and pics of another Servian. I can see the indexing plates that have had me scratching my head for some time. Could not remember their origin. Also don't fit any other work head. These are a good first T & C grinder but the lead screws and gibs are horrid. Having 1 grinder to do all the shops sharpening is OK but limited.
My shop built drill attachment is nearing completion after fitting a pivot to the bracket. During this work an idea struck me. This could be a good tool for point splitting as well. More pics and a story soon.
How about that sub forum for tool grinding?
BC
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27th Jan 2020, 04:56 PM #8Most Valued Member
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loverly
hi mate . thats a neat looking unit id like to make one. could you post any more photos.?
thanks
aaron.
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28th Jan 2020, 11:01 AM #9Senior Member
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Hi Aaron,
Attached I hope some photos of the grinding attachment on my machine, hope they help.
The last one is a micrometer stop / adjuster for the x travel to get a fine feed stop. Not my mod but came with the machine, its simply 2 off 45 degree pins. Alan
IMG_0105.jpg IMG_0104.jpg IMG_0107.jpg IMG_0109.jpg IMG_0111.jpg IMG_0113.jpg
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28th Jan 2020, 01:27 PM #10Most Valued Member
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The 45deg joint that has the black hex head bolt in it looks like its just a fixed 45 - is that correct?
Steve
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28th Jan 2020, 02:29 PM #11Senior Member
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Hi Steve, no, the vertical direction with the thimble is a sliding rod with a 45 deg end, that butts up against the horizontal rod which also has a 45 deg end, so wind the thimble and it moves the rod by x amount. A horizontally mounted micrometer head would be simpler but limited room for such without impinging on other things. Alan.
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28th Jan 2020, 04:18 PM #12Most Valued Member
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Thanks Alan, but I think I wasn't clear. I'm assuming you're referring to the 45deg stop?
I was meaning this vertical to 45deg connection, with the black hex bolt.
I've had a look on a bigger screen and pretty sure the first silver "collar" with the bolt in it is actually just a machined part of the grey vertical shaft. I initially thought they might have been 2 bits which could move relative to each other.
Steve
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28th Jan 2020, 09:16 PM #13Senior Member
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29th Jan 2020, 10:16 AM #14Senior Member
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Big drill grinder.
SAM_0591.jpgSAM_0592.jpgHi guys, the old goat is back.
If the first pic is clear enough the 2 chromed rings on the swivel head are unlocked by the hex head bolt and can swivel against each other. There are fine graduations and a reference line to allow adjustment when the locating plate is changed for drill size. I think to grind more off the heel of the land when used on larger drills. On my unit there is a rotation stop at the bottom of the pivot which limits rotation to about 90 deg. However there is no way to index this to the shaft that I can see. So trial and error was used to set it. On the main arm are settings for drill diameter to set the lip protusion past the pivot line.
Pic 2 has the progress on my monster drill jig. The bracket now has a pivot and the stop for the tang end is just needing a fixing screw. I offered it up to the Clarkson grinder and it looks like a good fit. Split pointing should be a goeer as well. I will make a smaller V to drop in later.
BCLast edited by steamloco1954; 29th Jan 2020 at 10:19 AM. Reason: new thought
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29th Jan 2020, 11:09 AM #15Senior Member
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Just to expand a little more on Steamloco 1954 excellent post with some additional photos.
The main pivot is at 12 deg to the horizontal bar
IMG_0117.jpg
The pivot head is at 45deg to its mounting shaft
IMG_0118.jpg
The bottom of this shaft has 2 cams to set swing angle
IMG_0120.jpg IMG_0121.jpg
Steve the bolt you were asking about fits into the following pivot
IMG_0122.jpg
The whole thing
IMG_0125.jpg
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