|Nicholas Farr||26/07/2020 18:01:27|
2405 forum posts
Hi, after buying a DRO and a couple of glass scale optical encoders in January last year at a good discount from ARC, I finally finished installing them yesterday. The X travel one was pretty much straight forward and is mounted at the front of the table, leaving enough gap to still have the stops to use. The lever type gib locks were removed anyway as they had a tendency to be in the wrong place and jamming while moving the table forward in towards the column, these were replaced with 40 X 8mm set bolts with the ends of the threads turned off and rounded much like the lever locks.
The reading head was attached with a couple of short stand off's, which should help any build up of swarf between the head and the two part brass bracket the fixes it to the Y travel, the upper part being held by the socket head bolts that hold the stop plate on.
The Y mounting was a bit more challenging. Two pieces of 40 X 40 X 5mm Aluminium angle were made and bolted on each side of the left hand end of the table, which carries another bit 90 degrees to the table and close enough to the saddle, to allow maximum X travel to the right.
Another piece of 40 X 40 X 5mm Aluminium angle was then attached back to back, so to speak, which carries the Y encoder, having it this way round will help the encoder being showered with swarf and any cutting oil. Two off cuts from the other bits of angle that made the brackets were used to pack the DRO away for bolting the two pieces of angle together, after using a DTI to set it to travel in a level plain and then drilling the other holes through.
A bracket was then press up from a piece of 6mm Aluminium plate, to secure the Y reading head in position and was fixed in place.
The cables were then secured with P clips, the X one along the top of the Y angles and then both onto a piece of second hand 50mm wide cable tray behind the machine and a small bracket of this tray was made, just to hold the loop of the X cable from sagging.
Finally the cables were carried onto another piece of cable tray fixed to the adjacent wall and up to the DRO.
All I want to do now is make and fit a protective cover for the X encoder to stop swarf and cutting oil getting on to it.
Edited By Nicholas Farr on 26/07/2020 18:11:39
|Colin Heseltine||27/07/2020 18:34:57|
|433 forum posts|
Fitted Quill DRO to my Gate PBM-2000 mill.
I had been given the brackets for a quill DRO of sorts when I purchased my mill. It was a bit Heath Robinson and I could not see a neat way to fit it to my machine and put it to one side. It had a good Mitutoyo scale with it.
I looked at the Mill Star quill DRO sold by Machine-DRO and had a chat with them and purchased just the bracket off them and made up the remaining bits I needed.
I trimmed the original scaled and refitted it and was able to set it correctly on zero.
Quite pleased with how it works. Just have to remember to switch it off.
Next job is to fit DRO to the knee.
|Anthony Knights||29/07/2020 02:58:47|
|419 forum posts|
All the bits for the Starret type clamps are completed, so I can assemble them. I'm not sure how they will be finished off yet. Polish on a sheet of fine emery cloth or blacken? Compromised with the jaw size which I have made 16mm. No second set because its just something else for the workshop gremlins to hide.
Edited By Anthony Knights on 29/07/2020 02:59:48
|Adrian Rawson||30/07/2020 17:05:47|
15 forum posts
Finished making a headstock mount for my divider project. Suffered a bit of grief from a home made 'Myford' collet but managed to get it tight enough to make this video **LINK**.
The mount, as designed, requires the lathe to have a quick change gear box as it relies on the stub gear as a fixing point. I couldn't find any where else to hold the divider firmly in place. The bracket with holes in is printed plastic. I made the mandrel extension with plenty of steel to fix the 'driving' collet to. Now I must make a handle for it to extend its usefulness.
|Anthony Knights||01/08/2020 17:02:34|
|419 forum posts|
Today I was cutting my lawn when the mower died. A quick check with my test meter revealed that, fuse OK, switch OK, motor not OK, in fact reading open circuit. this mower is about 30 years old and I am not going to reveal the make. Sufficient to say it has a revolving horizontal blade and is based on hovercraft technology. Lasting this long it had obviously avoided the final checks before leaving the factory. " We can't have these machines lasting more than ten years".
As any engineer would do, I stripped it down to look at the motor and found that the problem was due to a "spade" connector, which had gone high resistance and burnt out. A quick clean-up, solder the offending joint and back up and running. The thing which really annoyed me is that the motor is constructed in such a way as to make it impossible to check the motor brushes, without taking the risk of breaking the tabs with which the motor has been constructed in the first place. Motor label says "made in Sweden" which were obviously not into recycling back then. Should the brushes fail in the near future I will obviously have to risk bending the assembly tabs and hope they don't break.
|kirkpatrick hutchinson||02/08/2020 15:41:40|
|1 forum posts|
Currently ordering some new saw blades too since I currently need to replace mine.
|Howard Lewis||03/08/2020 15:47:33|
|3536 forum posts|
A friend of mine had the same problem, some years ago, with his Flymo.
He very carefully bent back the tabs, and bought some nearly identical brushes. He "ground" them to size on a strip of emery, and carefully rebent the tabs, so that the mower had another life.
|john fletcher 1||03/08/2020 19:22:15|
|617 forum posts|
Done it many time for our own and the neighbours mowers. You just have to careful when bending up the tabs or else they break off. If the tab does break off all is not lost, you drill a small/thin hole across the brush box, shorten the brush a bit and fit a thin split pin over the spring as a retainer Regarding bedding in carbon brushes brushes, you are aiming at creating an arc similar to the shape of the motor armature commutator. So glass paper upside down if you like, back and forth until the correct shape is created.. NOT EMERY as it is a conductor. Save fifty or more pounds and helping to save the earth. John
PS. Same with some washing machine motors.
|Anthony Knights||04/08/2020 08:45:52|
|419 forum posts|
Thank you for that information gentlemen.
|John Hinkley||04/08/2020 12:22:17|
927 forum posts
Today I crossed two jobs off my "round tuit" list. Firstly, when I fitted a digital scale to the quill of my VMC mill to complement the DRO, the original quill locking handle would foul the digital display at the lower extremity of the quill extension. I used a piece of aluminium off-cut to make a new extended handle and turned down the original locking handle for a tight press fit. Here's the before and after pictures:
The other job was to make a double-ended pusher to aid with the alignment of narrow stock in the lathe chuck. It took less than ½ hour and begs the question why I hadn't made one years ago!
Only downside is I've had to order a couple more toolholders from my favourite Leicestershire emporium.
|Anthony Knights||05/08/2020 18:41:02|
|419 forum posts|
I thought the scratch gauge in the last MEW would be really useful, so I went into the workshop today with the intention of making one. I couldn't find a suitable piece of square bar or a TC tip so I came up with this.
The 8mm rod is a piece from a dismantled printer and the scriber is part of a 3mm drill with a point ground on it. I make no claim as to originality, but I'm not really taking up woodwork.
Edited By Anthony Knights on 05/08/2020 18:41:51
|Roderick Jenkins||05/08/2020 23:36:28|
1924 forum posts
Today I milled some cow bone:
Works a treat.
|128 forum posts|
..that swarf will be a good source of phosphoros for the garden..
|Keith Wyles||06/08/2020 08:56:03|
|35 forum posts||
I prefer your design to the one in MEW, thought about making a similar one. I have been known to use my woodworking one on metal. To keep t square you need a widish face to run against the edge.
|Colin Heseltine||06/08/2020 15:23:04|
|433 forum posts|
Fitted the knee DRO to Gates PBM-200 mill.
Fitting the vertical mounting bar on the main body of the mill was quite a long task. It only had three fixing screws but 12 jacking screws to get the bar both vertical in both axes and square with the knee travel. Took several hours but in the end i manage to get it within 3 thou from top to bottom. The scale support profile was then fitted and set vertical.move to a shelf on a trolley.
Mounted the display below the main DRO display. I used to have a brackets with the R8 collets hanging below the display but decided the knee display was better here and the collets have moved to a shelf on a trolley.
With the power feed and the knee DRO winding the handle will no longer be a painful chore.
Having the power is great,so I then decided to modify the knee handle on my small Cowells mill to a simple power feed. The previous owner had added a handle to the winding know to make things easier. It works very well but when sitting at the desk and operating the handle I can hear and feel my shoulder creaking painfully.
Turned down a 10mm piece of silver steel and threaded it M8. Fitted three washers to replicate the handle and then tightened up a M8 nut onto the thread. Faced this off to produce a thin locking nut. Mounted the handle in mill and found center and then drilled and tapped M8. Fitted adaptor with some washers to space out above the center fixing screw.
Motive power is provided by an old Powercraft 1/4" electric screwdriver.
Works a dream
Edited By Colin Heseltine on 06/08/2020 15:26:48
|John Hinkley||07/08/2020 14:23:32|
927 forum posts
REALLY surprised no-one pulled me up on my mistake with the pusher tool! (See my earlier post above.)
My new toolholders arrived yesterday and some replacement dog point stainless grub screws came today. Fitted the pusher tool to a new toolholder and offered it up to a workpiece. What a silly billy - I'd set the bearings at 90° to each other such that when I moved it to the other orientation, it presented exactly the same way as previously! Luckily, there was enough meat left to chop off the end and re-tap so that it works as intended. That will teach me to not think a design through - or will it?
Here's what it should have looked like in the first place:
|Mark Rand||07/08/2020 22:39:09|
|918 forum posts|
The original layour made perfect sense to me, in terms of centring a piece on the faceplate. I hadn't considered orienting the tool in any other way!
|John Hinkley||08/08/2020 09:38:08|
927 forum posts
That's what I must have thought when I made the first one. When used in the orientation shown in the corrected version, above, it is used on the outside of the stock to push it gently into running true. Move it to the other position and the bearing runs on the end of the stock and, assuming that is square, will allow it to be moved to run true axially. With the original, the bearing presents itself to the stock on the face in both positions. You could always just have one bearing and swap it around in the toolholder, I suppose, but that rather takes away the "quick" bit of a QCTP! Having said that, presenting to the face is the position I would anticipate getting the most use.
|Martin King 2||11/08/2020 15:40:12|
|712 forum posts|
Spent today outside under the sun brolly fixing the seized up and filthy little watchmakers hand lathe that I got at Cheddar Car Boot Sale on Sunday along with a Wolf Jahn Cased watchmakers lathe.
Came up not too badly, the little work holders on the faceplate are really lovely bits of engineering in themselves.
Seems to be missing the front tool rest or fitment, not sure what that would look like?
|Neil A||11/08/2020 17:05:33|
|64 forum posts|
What a lovely little watchmakers lathe, even if you never actually use it. It deserves to be looked after.
A similar lathe, described as a "Burin Fixe" watchmakers lathe sold for £550 in 2018 at Flints Auctions.
A search under that name brings up quite a few images, you may find a suitable image to copy.
I think you were very lucky to find it.
Please login to post a reply.
Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!
You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.
Click THIS LINK for full contact details.
For subscription issues please see THIS LINK.