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Member postings for Pete Rimmer

Here is a list of all the postings Pete Rimmer has made in our forums. Click on a thread name to jump to the thread.

Thread: Electric bike fault
30/04/2022 12:55:18

I repaired one last year that had a fault in the wheel hub. The owner was compleltely mechanically inept, he was complaining about a loss of speed and range and then it wouldn't work. When I looked at it one of the bearings in the motor hub has disintegrated and bits of the cage has been floating about. and ripped off a hall sensor. I replaced the bearing and all three sensors, plus the well-knackered chain and he was off and running again.

I'm not suggesting that you have the identical problem but it might be worth checking in the hub and loom for water/foreign objects.

Thread: Question Re Camlock Chuck Fixings
28/04/2022 17:14:34

My 8" 3 jaw is held by three D1-3 pins. I see no problem with holding the same size chuck with 3 of the much stronger D1-6 pins.

Thread: Need advice on clearing Dads shed
28/04/2022 12:41:33

Things seem to sell well on the lathes website. I heard that Tony is very good about giving advice on valuation too.

27/04/2022 21:31:11

Chris you'll get a small fraction of the value if you let some clearance merchant take it all away for an easy profit.

The grey Myford Tri-Lever lathe has a gearbox on it, the gearbox alone is worth hundreds so don't let that go cheap. Gearbox models regularly seell for better than £1000 much more if there are steadies and chucks.

The blue shaper looks clean and tidy from what little is shown, there's a few hundred there. Usually they come without the vice because they lso fetch good money separately so don't let someone bid you silly on that either.

I can't see enough of the smaller black lathe to identify it but if it's complete and working there's a couple of hundred at least.

Bench drill has a couple of vices with it, grinder looks like a quality item.

The model on the bench and the one on the top shelf look nicely made but someone else will have to identify those and offer a value on them.

I would say that individually the items I've mentioned will get you comfortably north of £2k. If you take some better pictures and see what attachments come with the larger items you might do much better. Just looking around the pics, the well-used but well kept machines, nicely insulated workshop, home-made powered cross feed on the lathe your dad must really have loved his time in there. You should make sure you do him justice by getting a decent price for his stuff IMO.

Thread: Size of a Boxford metric Lead Screw
27/04/2022 16:04:58

Denford certainly used imperial stock sizes for Metric pitch leadscews. Their metric cross slide screw drawing calls for a 0.750" diamter 5mm pitch LH ACME form thread. A friend of mine enquired with someone for a Boxford cross-slide screw and he was also told it was a metric pitch but ACME form screw, but I cannot verify that. I have an imperial drawing but not a metric one.

Thread: Myford change wheels
24/04/2022 10:43:33

Not completely redundant but most of them will not be needed in normal work.

Sell them - they fetch reasonable money.

Thread: Drilling holes in thin material
23/04/2022 13:53:17

A good old trick.

Another trick I have found if you want to open up a hole a tiny amount in even very thin sheet - get an old adjustable reamer and turn all of the cutting flutes around so they form a very shallow taper instead of parallel. It works great, cuts smooth and you get a very round hole of very precise size (if you're careful). You do get slightly tapered sides to the hole but nothing you could measure on thin sheet.

Thread: Eagle surface grinder motor and pulley selection
21/04/2022 21:18:19

Oh yeah the spindle lock is very worthwhile. There's no other handy way of holding the spindle to loosen the nut.

I too had a thought about a gib lock but because of the design of the gib it's not so practical. Either way I haven't found it necessary for dressing, the slide stays put.

21/04/2022 13:25:45

Variable speed can be a boon on a grinder. If you find your wheel is too hard you can slow it down so that it behaves 'softer'.

Thread: Harrison m250
21/04/2022 07:57:09
Posted by JasonB on 21/04/2022 06:57:07:

Just watch the pressure angle which is likely to be 20pa as some of the cheaper DP cutters are 14.5pa.

For future use this is the table that I use when comparing DP, MOD and circular pitches.

I hav e the same chart on my wall laminated in A3, it's one of the handiest charts I know and so well laid out.

20/04/2022 22:45:51
Posted by JasonB on 20/04/2022 20:37:23:

That would be 5mm metric circular pitch, though you may get away with 16DP which is very close.

Not just very close - VERY close - half a thou per pitch which is the same as nothing at all for the application. Cut a 12T 16DP gear.

In theory, your 16DP 12T gear should have an OD of 22.23mm plus the long addendum adjustment of 1.98mm to give 24.21mm diameter but they might not have added so much addendum due to it being engaged with a rack I dunno. If you are confident that your OD measurement is correct and hasn't been affected by wear, cut a pinion of that diameter and cut 12 teeth of 16DP into it.

Thread: Myford ml7. Longbed for under £200
17/04/2022 17:01:25

If i t was in a fire the pulleys would be gone. I think it's just been poorly kept and then neglected in damp storage.

17/04/2022 14:31:25
Posted by David-Clark 1 on 17/04/2022 14:19:49:

Can you post the photos here? Sounds like you may be a scraping expert? Perhaps a series in MEW about scraping.

He's added pics in the advert David.

Scraping novice is more like it. Just because you do a lot of something doesn't make you any good :D

17/04/2022 14:14:41

I asked for better pictures of the bed. It's a bit grim but not unrecoverable.

16/04/2022 22:59:41

Even if the bed is worn it would be worth it. If I didn't have a big queue of scraping jobs in front of me I'd certainly pay the asking price, scrape the bed and it would make a very nice base for a rebuild.

EDIT: Actually having studied the wide angle pic more closely it seems that the seller has cleverly hidden the fact that the bedway is severely pitted on the rear way near the chuck.

Edited By Pete Rimmer on 16/04/2022 23:07:18

Thread: Eagle surface grinder motor and pulley selection
16/04/2022 16:57:39
Posted by AJAX on 16/04/2022 15:47:55:
Posted by Pete Rimmer on 16/04/2022 14:11:52:

Yes my Eagle motor was 2 pole I fitted a 4-pole and had to make a new pulley to suit. I Went all-in and made poly-vee pulleys.

If you're going to re-motor it watch the overall length of the motor/pulley combination or you'll find that the z-axis screw will foul the back of the motor.

Pete, why did you opt for poly vee pulleys? Was slippage an issue? I've only tried the machine once, and that was at the seller's premises. All seemed to be good.

I'm aware of the z-axis screw issue, and that's why I would prefer to use one of my existing motors which I believe will fit.

I had to make a bigger pulley and had a small pulley plus the belts were easy to get at the motor factors who have a very small selection of vee belts now.

16/04/2022 14:11:52

Yes my Eagle motor was 2 pole I fitted a 4-pole and had to make a new pulley to suit. I Went all-in and made poly-vee pulleys.

If you're going to re-motor it watch the overall length of the motor/pulley combination or you'll find that the z-axis screw will foul the back of the motor.

Thread: Zyto lathe problem
14/04/2022 18:07:10
Posted by SillyOldDuffer on 14/04/2022 09:03:29:
Posted by Pete Rimmer on 14/04/2022 00:13:56:

I rather think that it's just more intuitive for human minds to deal with. Ask yourself why no car steering wheel turns to the left to make the wheel turn right? With your hand on top of the wheel your hand and the carriage will move in the same direction, same as when driving a car.

I agree wholeheartedly, but there is a counter example.

For two centuries after the invention of the ship's wheel, it turned the wrong way. I guess this was to mimic the action of a tiller where moving the arm left, causes the ship to turn right. (Port and Larboard, shipmates.) #

In the Titanic film, I believe the helmsman spins the wheel in the modern direction to avoid the iceberg, which would have crashed the ship straight into it. Pity he didn't, because scraping along the side of the berg caused multiple leaks along the length of the front section that bypassed the watertight bulkheads. If the ship had hit head-on, the bow section would gave been severely damaged, but the ship would probably have stayed afloat.

Titanic isn't a good guide to driving a lathe. Never good to smack the saddle into the headstock!

Dave

# Hope I didn't dream the direction thing, can't find a reference on the internet.

I never heard of that I must confess. Tiller steering makes just as much intuitive sense as steering wheels if you think about it, because tillers steer the ship by swinging the back in the direction that you push the tiller. That the front turns to the opposite direction is incidental.

14/04/2022 00:13:56

I rather think that it's just more intuitive for human minds to deal with. Ask yourself why no car steering wheel turns to the left to make the wheel turn right? With your hand on top of the wheel your hand and the carriage will move in the same direction, same as when driving a car.

Thread: Rising costs of materials
10/04/2022 00:25:32

Given that Ukraine is (was) one of the biggest suppliers of steel billets this is hardly surprising. I did hear in the news that their largest steel mill had been partially destroyed too so even if the conflict does end production won't be soon to resume.

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