johnthepump
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Building 7 1/4"G Edward Thomas
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Post by johnthepump on Nov 16, 2016 10:04:40 GMT
A little job that I get asked to do every couple of years is to make half a dozen Ariel formers out of 6mm PVC 15.11.2016 by John The Pump, on Flickr They are 153mm diameter and are to wide to do in one hit on my Micromill, it has a bed width of 90mm. So I came up with the idea of doing them half at a time then turning them over and continuing the programme. the billets are cut from a sheet and the mounting holes coordinate drilled on the mill with the DRO. they are then bolted down on the front row on the Micromill using a previous centre portion as a spacer. 15.11.2016 by John The Pump, on Flickr With the second half of the programme run the waste falls away, the hole are countersunk on the drilling machine, while the next one is machining. 15.11.2016 by John The Pump, on Flickr The cutter is a 3mm single flute carbide Alu Power running at 5200rpm ( Wilf mentioned these in the carbide thread recently) they leave a very good finish. The last step in the job is to put the groove in the edge, to do this I bolt three rings together, for rigidity and mount them on a 4 jaw chuck backed up with a centre. 15.11.2016 by John The Pump, on Flickr I hope this was of interest. John.
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Post by RGR 60130 on Nov 16, 2016 11:07:43 GMT
I like that table John. I'd imagine the time taken to make it will be repaid many times over.
Reg
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johnthepump
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Building 7 1/4"G Edward Thomas
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Post by johnthepump on Nov 16, 2016 18:51:43 GMT
Hi Reg, The sub plate was an optional extra when I bought the mill the holes are tapped 6mm and are spaced on a 12 mm grid. It came with 4 cam headed screws and hexagon plates which are useful for clamping thin parts, I will put one up next time I take a mill picture. Regards John.
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Post by RGR 60130 on Nov 16, 2016 19:54:49 GMT
John,
I like the holes across the front as well. This has got me thinking. Maybe a tenon that locates in a tee slot for instant alignment in Y, a means of location in the X direction and the overall size to represent the operating envelope so if the job fits the sub table then it can all be machined. Something like that would come in very handy at present as I'm machining bits for a hotrod intake system and positioning is a bit critical due to the size.
Reg
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johnthepump
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Post by johnthepump on Nov 18, 2016 10:17:12 GMT
John, I like the holes across the front as well. This has got me thinking. Maybe a tenon that locates in a tee slot for instant alignment in Y, a means of location in the X direction and the overall size to represent the operating envelope so if the job fits the sub table then it can all be machined. Something like that would come in very handy at present as I'm machining bits for a hotrod intake system and positioning is a bit critical due to the size. Reg Hi Reg, The front holes were added by me, over time they have come in useful and only Wednesday evening they were used to set front stops. One of the team brought in three plastic boxes that were for a project that his son was working on ( something to do with hospital radio). The box lids needed an elliptical speaker hole along with four fixing holes and a hole for the volume control with a smaller along side for the anti rotation tab. The X reference was the small ali plate held with the cap screw and the black clamps held the job down. I have put a dog tag held in place by the little eccentric clamps I spoke of earlier just to show what can be clamped onto this sub plate. John. 17.11.2016 by John The Pump, on Flickr
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Post by Roger on Nov 18, 2016 12:43:03 GMT
Hi John, What do you make of those eccentric clamps? I've never used them, but they do seem to be handy on occasion. Something round like that isn't a problem for me, I'd use a chuck, but an awkward shape couldn't be done that way. Where did you get them from?
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johnthepump
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Building 7 1/4"G Edward Thomas
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Post by johnthepump on Nov 18, 2016 13:49:06 GMT
Hi John, What do you make of those eccentric clamps? I've never used them, but they do seem to be handy on occasion. Something round like that isn't a problem for me, I'd use a chuck, but an awkward shape couldn't be done that way. Where did you get them from? Hi Roger, This set of clamps came with the MicroMill. I have just had a look at the original paperwork and their listing is ambiguous, however I do recall seeing some larger ones somewhere a few years ago and I will try and find out where they came from. John.
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Post by Roger on Nov 18, 2016 15:23:14 GMT
Thanks John, I think someone was making them to sell at Alexandra Palace, but I wasn't that impressed by the price or quality. I think Cutwel do professional versions. To be honest, I could probably knock them up easily enough.
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johnthepump
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Post by johnthepump on Nov 18, 2016 18:12:06 GMT
Hi Roger, I'm sure you can make yourself some of these, so here is a close up view. The thread is M6 and the head is 8.1 mm. the movement is 1.2 mm. The hole in the Hex part is tapered and a small ridge at the bottom, as the clamp grips it tips slightly holding the job down. John. 18.11.2016 by John The Pump, on Flickr
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uuu
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Post by uuu on Nov 19, 2016 21:03:36 GMT
One of last Wednesday's jobs at the Pumphouse - while John got on with milling the speaker housings: I've been trying to solve the sticky cross-slide feed on my new lathe. As well as the shot thrust bearing, the leadscrew nut was not straight - and the leadscrew itself had a bit of a wobble on it. It's clear the lathe has had a bit of a whack at some point. So I used John's lathe to turn down one end of the nut, and make a sleeve to bring it back up to the diameter of the fixing hole - fixing one Myford with another. This, together with a bit of biffing to the leadscrew (John has a practised touch when it comes to straightening bent shafts), should mean we're back to a smooth action - we'll see. Today, I've applied glue to the sleeve, and I might be able to do a reassembly tomorrow, and trial to see how much improvement we've made. Wilf
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Post by uuu on Nov 20, 2016 16:19:55 GMT
Success! The lathe's all together now and smooth as silk.
Wilf
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johnthepump
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Post by johnthepump on Nov 20, 2016 16:32:17 GMT
Success! The lathe's all together now and smooth as silk. Wilf Now is the time to get on and make something on it.🚂
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johnthepump
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Building 7 1/4"G Edward Thomas
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Post by johnthepump on Nov 20, 2016 22:11:16 GMT
Sunday evening and I found some workshop time, so the frames were set up on the mill and the holes to mount the cylinders were drilled and reamed. 20.11.2016 by John The Pump, on Flickr I couldn't resist temporarily putting the frames together and mount the cylinders and the horn blocks. I now have got lots to get on with. 20.11.2016 by John The Pump, on Flickr Lastly on returning indoors I got on with making some more sultana scones, but I took preventative measures to stop Steve pinching them off the cooling rack. 20.11.2016 by John The Pump, on Flickr
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Post by Deleted on Nov 20, 2016 22:30:26 GMT
haha...love the scone picture John, that should slow down those pesky scone grabbers...don't think it will stop them completely, though. I don't blame you for not resisting the urge the bolts bits on, I suffer from the same affliction as others here do too....the loco is looking great..... regards Pete
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Post by springcrocus on Nov 20, 2016 22:57:25 GMT
PMSL Steve
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johnthepump
Part of the e-furniture
Building 7 1/4"G Edward Thomas
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Post by johnthepump on Nov 20, 2016 23:05:06 GMT
PMSL Steve Sorry Steve, I never did understand these shorthand type things. The wife has just explained.
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Post by springcrocus on Nov 21, 2016 0:10:08 GMT
Aha!! I knew I had these lurking in the workshop somewhere. Now, where's the strawberry jam? Steve
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Post by Deleted on Nov 21, 2016 0:47:35 GMT
See, I told you, John, you won't stop those god damn scone grabbers mate....
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johnthepump
Part of the e-furniture
Building 7 1/4"G Edward Thomas
Posts: 493
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Post by johnthepump on Nov 21, 2016 11:01:04 GMT
Aha!! I knew I had these lurking in the workshop somewhere. Now, where's the strawberry jam? Steve In the end the joke was nearly on me and the bolt croppers may have been necessary as I couldn't remember where the key was, but after half a hour of looking I found it in the van toolbox. John
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Lisa
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Post by Lisa on Nov 21, 2016 11:03:45 GMT
Personally, I'd have just nicked one from the back where there's no lock.
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