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Post by dave1800 on Aug 20, 2023 6:41:38 GMT
If that's the speed sensor which is triggered by a magnet it's the same as the one I purchased a few years ago for the same purpose and it has been totally reliable. It's all looking good.
David
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Post by Penguin45 on Aug 20, 2023 20:37:48 GMT
Sounds the same. This is the ad:  Clarke CMD300 Mill by Penguin 45, on Flickr I'm gradually acquiring all the bits to use it properly. A set of thin parallels is the next target. Later will be collets. C. |
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Post by dave1800 on Aug 21, 2023 7:26:41 GMT
Yes, that's the one. Cheaper than buying the bits to make it.
David
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Post by Penguin45 on Sept 16, 2023 8:19:23 GMT
With the polyurethane stuff, it's quite nice to make ten of this or twenty of that. Large numbers can cause sanity issues. So what do you do when somebody wants 100 bushes?  Morris Eight spring bushes by Penguin 45, on Flickr Just get on with it, of course! The Morris Register ordered up spring eye bushes for the Morris Eight, and who am I to say no? C. |
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Post by dave1800 on Sept 18, 2023 9:13:09 GMT
What are the safety issues - apart from you being bushed by the time you've finished?
David
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Post by Penguin45 on Sept 18, 2023 17:18:58 GMT
I see what you did there...
Safety's a bit of a hard call. The 'Crab stuff rides around on my car for a while, just to convince me. There is some basic stuff first. First casts are uncoloured, which lets me check for inclusions. These are usually air and can be caused by a quirk of the mould design or bad pouring. Then I make a few coloured ones and check for Shore (hardness) rating. When fully cured I try and destroy them! That's usually pretty difficult even allowing for me not being as strong as I once was.
In the case of the bushes above, they were made to the Morris Register's specification, test samples made as above and a small selection sent to the Club for their people to have a play with prior to accepting the bulk order. Evidently they were happy.
The mould was made as four to show, so twenty five lots of moulding, which became twenty six after inspection and a few extras had to be made. By the end, I was pretty much sick of the sight of them.
Chris.
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Post by Penguin45 on Oct 1, 2023 10:15:07 GMT
 Bangers'n'Cash by Penguin 45, on Flickr Visitors at work this week. Dropped off one very rotten Mini. No doubt coming to a screen near you in the near future. Chris. |
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Post by Penguin45 on Oct 7, 2023 21:10:16 GMT
There's a danger of me taking over Nick's OKR thread, so I'll do a summary and update here. Tony Wood (And Nick) want rear quarter window pivot rubbers. Nick's done all the design work and has found a way to possibly 3D print them. He's been kind enough to share the design documents with me, so I'm having a crack at it the old school way.  Window Pivot Rubber by Penguin 45, on Flickr Rough blank done on the mill.  Window Pivot Rubber by Penguin 45, on Flickr Filed and sanded to shape.  Window Pivot Rubber by Penguin 45, on Flickr Tongue insert for the mould made as well.  Window Pivot Rubber by Penguin 45, on Flickr Latex mould making - first attempt. Polythene block for the base with a sheet of PVC glued to it to give a super smooth surface. The rod sticking up will become the pour hole, the smaller rod will become a breather hole.  Window Pivot Rubber by Penguin 45, on Flickr Nearly - bit missing from the flange caused by an air bubble no doubt.  Window Pivot Rubber by Penguin 45, on Flickr Take two. Success. You can see the tongue fitted to the base, as well as the three pins to ensure correct registration. BUT - will we get a pivot rubber? Tune in tomorrow to find out. C. |
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Post by 1800heap on Oct 7, 2023 21:46:45 GMT
Looks really good Chris. I was wondering if you would have to pour that way up. I am looking forward to seeing the result.
My TPU filament hasn't arrived yet so I am not even close to trying to print it. It is quite touchy with moisture, according to my usual source of 3d printing info, YouTube! You have to cook the filament before use to get a good result aparrently, which does not sound good.
I think the old method may be a winner!
Nick
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Post by Penguin45 on Oct 8, 2023 10:21:03 GMT
Yes, face down. That way I'm guaranteed to get a nice facing surface, which is the visible bit.  Window Pivot Rubber by Penguin 45, on Flickr Well, it works. The surface sheen is the mix not curing fully. This leaves the surface slightly sticky. The 50 shore poly I've got left is very old, so I will order up fresh supplies. Should be here Wednesday, and I'll see what we've really got. I'm pretty pleased with proof of concept though. C. |
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Post by Penguin45 on Oct 9, 2023 15:08:17 GMT
No PU until Wednesday. In the meantime, I contacted Moore & Wright about having my decent digital caliper repaired. The body with the electronics inside had developed slop, allowing it to move from side to side and thus destroying the accuracy. I was very disappointed to receive a reply stating that it would cost more to repair it than replace it. This is a £70 caliper, not the usual £15 Chinese tat for heavens sake. Seeing that I was now on a hiding to nothing, I peeled the label off the back to investigate.  Moore & Wright Digital Caliper by Penguin 45, on Flickr. All four of those screws going through the backplate were slightly loose, so I nipped them up and Bingo! Slop gone and stable readings restored. Rather pleased with that and at least £70 saved.* Chris. *Because Yorkshire... |
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Post by Penguin45 on Oct 11, 2023 21:57:12 GMT
New supplies arrived today, so a bit of casting this evening.  Window Pivot Rubber by Penguin 45, on Flickr It works! Nice facing surface. You can see where the sprues have been trimmed off the back, but they will be inside the window frame and no-one will ever know. Quite chuffed. Chris. |
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Post by Penguin45 on Oct 15, 2023 12:47:17 GMT
The lathe has required some remedial work. The level of chatter and vibration had risen to become unacceptable. Deep cuts and parting off became impossible and the surface finish had become poor. The weak spot of any lathe is the compound (The top sliding bit with the tool on). On this one, it is fitted and controlled by a gib strip, itself held by three grub screws. Now the compound is over twice the length of the block on which it mounts (cross-slide), so the gib is secured by only two of the three screws most of the time. There was lateral play and tightening the screws simply made the compound too tight to move comfortably. Additionally, there was a considerable amount of backlash on the handle. Backlash is controlled by a pair of nuts on the end of the shaft and is incredibly fiddly to try and set up. Making up a block to allow the flange on the shaft to have something solid to ride against when being wound out would solve the lash problems.  Mini Lathe - Gibbs by Penguin 45, on Flickr A recess was milled into the rear of that plate and with a .2 mm shim reduced the lash at the handle down to .001". I'll take that.  Mini Lathe - Gibbs by Penguin 45, on Flickr The gib on the compound turned out to be bent, so a universal adjuster was deployed to straighten it. After the caveman bit, I observed that the grub screws didn't locate into the indents on the gib. They do now, as do the ones for the extra three grub screws fitted.  Mini Lathe - Gibbs by Penguin 45, on Flickr There was a similar situation with the cross-slide. The extra length allowed me to up the number of grub screws to seven. Re-shimming the handle also reduced the backlash. I went to re-fit the the cross-slide, plopped it onto the carriage and there was a clonk and the carriage moved. Poking about showed that the front of the carriage could be lifted significantly.  Mini Lathe - Gibbs by Penguin 45, on Flickr The carriage location is controlled by a metal strip. It's fitted as above. That's no even engineering, it's just cheap and nasty. And completely unreliable.  Mini Lathe - Gibbs by Penguin 45, on Flickr It needs to look like that if it's going to work.  Mini Lathe - Gibbs by Penguin 45, on Flickr Step cut with the mill, followed by an hour or so of filing and stoning to get an exact fit.  Mini Lathe - Gibbs by Penguin 45, on Flickr It fits under there. Nice. So, everything cleaned and lubricated then re-assembled.  Mini Lathe - Gibbs by Penguin 45, on Flickr Spent some time setting up the gib strips and now everything moves smoothly with light resistance.  Mini Lathe - Gibbs by Penguin 45, on Flickr Final action was a few test cuts. The surface finish has visibly improved, so I'm pretty pleased with that. C. |
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Post by Penguin45 on Oct 16, 2023 11:02:13 GMT
Looks like I've cracked the pivot rubber moulding and got some consistency.  Window Pivot Rubber by Penguin 45, on Flickr Just got to rattle up some stock now. C. |
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