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Member postings for Chris Trice

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

Thread: Jacobs arbor marking
26/02/2019 19:46:21
Posted by Nicholas Wheeler 1 on 26/02/2019 17:40:03:

Going back to the original post, there's no mention of how well the arbor works. Which is what really matters.

You're forgetting how long it can maintain that initial standard and its life span generally. I could make an accurate drill arbor out of aluminium that would be true and accurate but I don't rate it's longevity.

Thread: Myford S7 countershaft bush temperature
26/02/2019 11:19:37

PM sent Dennis.

Thread: Jacobs arbor marking
26/02/2019 10:57:46
Posted by JasonB on 26/02/2019 06:52:12:
Posted by Chris Trice on 25/02/2019 20:47:52:

Or they've outsourced manufacturing overseas. Hopefully they get the best ones.

That does not stop them having their name on the product, the factories will add your logo just like UK factories add different logos to the products they make.

As you paid a premium for it I would hope they have them made to a higher spec and pass the cost on.

This one has no markings at all except the size of the two tapers with a blackened tang and a narrow black band between the two tapers. Not proof in itself but it's actually the inspector label which makes me suspect its origin because that is identical in style and typeface (light blue, fading top to bottom, black " CERTIFICATE Inspector" and a black pinstripe border, and with a red stamped number) to ones that come with equipment sold by the big suppliers. I have a set of very cheap mediocre collets with an identical label which is where my suspicion comes from.

Thread: Bench Grinder
25/02/2019 20:52:03

B&Q have the 150 watt cheapie one (available from practically everyone with their own label) for £20 under their European sounding Mac Allister brand.

Thread: Jacobs arbor marking
25/02/2019 20:47:52

Or they've outsourced manufacturing overseas. Hopefully they get the best ones.

25/02/2019 19:33:07

It's funny this should come up now. I paid the extra on eBay from a UK dealer to buy a genuine (and advertised as) "Rohm" MT2 J2 drill arbor that arrived this morning (after a six day wait) with no markings on the plastic box or the arbor itself but the Inspector Number label that fell out is identical to the ones you find in the budget arbors from overseas. Spinning it between centres it appears well ground and concentric but I object to paying for the genuine product but getting what I suspect is what I was specifically trying to avoid that I could buy elsewhere for half the price. I'm of two minds to contact Rohm and ask if it's genuine.

Thread: Logging in to forum
25/02/2019 19:23:24

Actually forget that last bit. I suspect I was censored.

Thread: Plastic Balls in Bearings?
25/02/2019 16:49:08

Don't we all?

Thread: Logging in to forum
25/02/2019 16:47:12

I've just had the forum tell me I need to reset my password for the third time this week and one of my posts I made earlier today has disappeared.

Thread: Plastic Balls in Bearings?
25/02/2019 09:14:04

Dyson BTW are the top bar on the graph outselling their nearest rival by three to one.

Edited By Chris Trice on 25/02/2019 09:23:08

25/02/2019 01:04:01

If both do the job and one is cheaper, which would you use?

24/02/2019 19:48:35
Posted by Bandersnatch on 24/02/2019 17:09:31:

Sorry Chris, I don't see that gives me any warmer feeling .... it's basically the same hyperbole as for all the bearings - they are trying to flog them after all.

It's just that the brush rollers seem to take such a beating that they wouldn't be the place to skimp. Weight and noise aren't serious considerations in that case either.

Edited By Bandersnatch on 24/02/2019 17:11:51

Cost and maintenance free are though. Can't say I remember ever seeing metal ball races on the brush rollers of any vacuum cleaner so obviously not as big a beating as imagined. Actually I'd argue that if you're an older person dragging a vacuum cleaner up and down the stairs, weight is quite important.

24/02/2019 16:41:24

Fourth item down:

https://www.mscdirect.com/industrialtools/plastic-ball-bearings.html

24/02/2019 16:38:18
Posted by Bandersnatch on 24/02/2019 16:26:54:

Hard to imagine that plastic balls have the load-carrying capacity of steel balls.

Depends on their intended duty. For vacuum cleaner brush rollers or wheels etc, they'd be fine. We use them at the studio for mechanical suits if we need to keep the weight down for the actor.

Edited By Chris Trice on 24/02/2019 16:38:44

Thread: Welding helmet
24/02/2019 16:25:24

Most BOC outlets have welding masks like this where their retail counter is. They only stock "good" ones that are not unduly expensive.

Thread: Plastic Balls in Bearings?
24/02/2019 16:17:29

I doubt very much Dyson are using expensive ceramic bearings when completely plastic ones are available and perfectly serviceable in this context. You can get them from MSC/J&L or RS. Their main advantage apart from being water corrosion proof is they don't need to be lubricated.

Thread: Cross drilling a lead screw
24/02/2019 00:56:35

The video linked to above has an alternative solution. All you have to do is turn part of a disc with a hole the size of the feedscrew and screw it to the cylindrical part that bolts to the top slide casting with spacers the same thickness as the flange or simply machine a recess in the partial disk the same depth as the width of the flange and screw it to the cylindrical part thus trapping the flange between the two parts.

Thread: Warco Super - Major Vario inaccuracy
22/02/2019 16:27:38

Variations of these are used to check camera lens element alignments with similar accuracy.

Thread: 'upscale' machines
22/02/2019 16:20:00

Nice and just a teeny bit jealous.

Thread: lathe to cut 26tpi
22/02/2019 09:15:13
Posted by not done it yet on 20/02/2019 23:03:33:

3.2mm is close enough to 3mm for a myford?smiley Not that even a 3mm pitch would be so useful!

3.175mm please.

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