Epoxy Bearing Materials and Method

[John McNamaraParticipant @johnmcnamara74883]

Powerpoint presentation and formula

[Les Jones 1Participant @lesjones1]

Hi All,

I have some suspicions about this post. clicking on the link opens more web pages. I could be wrong but would advise caution on downloading and running the power point presentation.

Les.

[David Clark 13Participant @davidclark13]

Hi There

I tried it and Norton blocked an attack.

I have deleted the post.

regards David

 

[Nicholas FarrParticipant @nicholasfarr14254]

Hi David, I had exactly the same thing happen, so didn’t go there again.

 

Regards Nick.

[dcostaParticipant @dcosta]

Hello!

I gained access to the site’s URL and I had an experience quite different from yours.
The site is one of those third-party stores files for download.
And my protection system was not alarmed at all. Neither the firewall or antivirus (both AVIRA) nor protectors against addware or malware.
I downloaded the file, read it and now, alarmed by your posts, submited the file downloaded to an antivirus analysis. It’s clean.
I must say that its content is quite interesting.
It may be worth contacting the author to use another mechanism to provide the file.
However if anyone is interested in contacting the author directly, the contact is as follows:

John McNamara
john1147@bigpond.net.au

Best regards
Dias Costa

[_Paul_Participant @_paul_]

It’s a quite harmless 41.9mb Powerpoint, scanned with Avast.

 

Gents Is Norton giving you false positives?

 

[John McNamaraParticipant @johnmcnamara74883]

Hi all

 

32 MEW members have have downloaded that file

 

I placed it on a couple of US sites as well All OK there and a substantial number of persons have downloaded the file.

 

I have had an account at Mediafire for almost two years. and have had over 1200 people download from the site. (I have another interest unrelated to engineering)

 

If you read the presentation you will note I offer nothing for sale from me and apart from giving a couple of suppliers that may assist any person interested in experimenting The information is shared freely.

 

I thought it might interest the engineering community in the UK.

My interest is in alternative manufacturing technology

 

MEW members have downloaded the file 32 times. from not that many more views. The link I gave is only for MEW members. Mediafire does not give the address of a downloader just the overall count. Pretty good interest in the subject.

 

Mediafire is a free file hosting site that earns it income from banner advertising.

Unless you click the advertising it will not open.

 

Thank You

 

John McNamara

 

 

 

 

 

[Les Jones 1Participant @lesjones1]

Hi John,

I apologise for being suspicious of downloading your file.

Regards Les.

[John McNamaraParticipant @johnmcnamara74883]

No problem Les

 

Cheers John

[Richard ParsonsParticipant @richardparsons61721]

Did a Google search on the title McAffee showed all sites were green (OK) but that may be nothing as I have had problems with McAffee over the past few months.

The stuff looks interesting

Rgds

Dick

[John HaineParticipant @johnhaine32865]

Remarkably little content for a file of over 40 Mbyte! What there is is interesting and innocuous, I have re-saved it as a PDF which reduced the file size by a factor of about 100! As it’s a PDF I can’t post it so have emailed it to Dave Clark as editor.

 

(By the way, WHEN will we able to upload other file types than jpegs? All the other engineering forums allow it.)

 

John

[John McNamaraParticipant @johnmcnamara74883]

Hi John

Yes you can compress the file. You can do it with PowerPoint itself. All the photographs were taken with a Nikon D80 at high resolution. I decided not to reduce them. How many times have you found an interesting project on the net, only to find the images were only screen resolution. Not allowing you to zoom in to see the detail.

Using the option from within PowerPoint to reduce resolution to screen resolution brought the file size down to 4844k

These days most users have ADSL internet connections so 40MB comes through pretty fast. I could post the low res version if any user has a dial up connection.

The original presentation had to fit in about 10 minutes the time allotted, it was therefore necessarily brief. A lot of people have responded with questions which I have answered; good to see there are kindred spirits. By placing the formula in the public domain it should see improvement as others try a different approach and post their findings.

Cheers

John

 

Edited By John McNamara on 21/04/2011 01:16:46

Edited By John McNamara on 21/04/2011 01:18:23

[John McNamaraParticipant @johnmcnamara74883]

Hi All

Gee computers can be such fun! A lot of discussion has been had with Mediafire about why Norton objected. I guess we will never know. In order to avoid any annoying third party adds popping up I converted my subscription to a paid one, this means that the third party advertisements do not show. Only the main web page.

————————————————————————————————–

Herewith is the post again:

Attached is a powerpoint I did for epoxy bearing material
It was presented in Melbourne Australia

A piece of threaded rod with epoxy nut decribed:

I posted a copy of the file here (with high resolution images) 41mb:

http://www.mediafire.com/file/ttxoomm025htxeu/Epoxy%20Bearing%20-%20MEW.ppt

 

Also a copy with low resolution images 4.5mb:

http://www.mediafire.com/file/022r26w92qxcn10/Epoxy_Bearing_-_Compact.ppt

 

Cheers

 

John

 

[John McNamaraParticipant @johnmcnamara74883]

Mediafire are doing maintenence and will be offline for an hour or so.

Looks like its done already  

Cheers

John

Edited By John McNamara on 21/04/2011 14:19:31

[KraeheParticipant @kraehe]

Thanks John. Very interesting – especially so given the local (Aust) perspective.

 

Regards,

[Bernard WrightParticipant @bernardwright25932]

Hi John,

Just downloaded your PP file, looks very interesting to me, thank you.

I only use the included AV with Win 8.1, I actually suspect all the others as being the orinators, to gain profit from those whom believe them…

[Michael GilliganParticipant @michaelgilligan61133]

John,

I've just downloaded the "compact" version onto the [first generation] iPad and saved it into GoodReader.

… about thirty seconds for the whole operation.

Great job, thank you.

MichaelG.

Edited By Michael Gilligan on 27/04/2014 08:21:04

[John McNamaraParticipant @johnmcnamara74883]

Hi Michael
Hi Bernard

It is great to get some feedback. The file has been downloaded many thousands of times. Unfortunately not everyone is a courteous. I guess that is the nature of the internet.

The thread and nut test piece as shown in the Power point has never loosened up. It was only a test piece so it has never seen duty in a machine , however many people have played with it twisting it back and forth….

My lathe saddle is still running on that material between it and the bed without a hitch, the saddle must weigh over 150 KG I have to crane it off. Just for interests sake when I get some free time I am going to remove the saddle and check the actual condition of the material. its been a few years since I did it.

My Heidenreich and Harbeck 21 RO Lathe is similar to but a little younger than this one
**LINK**

Although I have not tried it I do not believe Epoxy composite bearings will work well for high rotating or sliding speed applications.

They work very well for machine tool slide ways. (some new machines come with them) the material is also very good for bedding and grouting parts together after precision aligning them.

Regards
John

[egaParticipant @ega]

John McNamara:

I found a good deal of interest in this revived thread, not least in your presentation once I was able to view it!

I dumped MS Office some years ago and currently use the ("free&quot Document Foundation suite. In retaliation (?) MS Windows Firewall blocked the Document Foundation presentation program from displaying your low-res images so I took a hint from Michael Gilligan and viewed them satisfactorily on my (Samsung) tablet via the bundled Polaris office suite.

It was very encouraging to see your splendid lathe rehabilitated through the magic of epoxy resin.

Your last slide asked for questions. Was there any discussion of slideway lubrication and whether it is needed with this method?

[John McNamaraParticipant @johnmcnamara74883]

Hello EGA

Yes normal lubrication is required. Epoxy being resistant to most (Nearly all) chemicals once it is cured, is not affected by mineral based lubricating oils or water based soluble oil if you use it. If you study the images in the power point you will see I reinstated the original oil pockets in the epoxy material with a die grinder. The lathe has a small plunger pump that is operated by the saddle traverse handle to provide lubrication to the ways.

The lathe I restored was very worn. Once the ways were ground the and the saddle raised to the correct height there was quite a large gap nearly 2mm between the saddle vees and the bed vees. In this case I did not grind any more material from the underside of the saddle I did use a wire wheel to deglaze and clean the vees under the saddle, alternating with thinners and methylated spirit to remove as much oil as possible from the cast iron for good adhesion before applying the bearing material.

When I got the lathe the backlash on the saddle hand wheel was about a quarter of a turn. Once raised to the correct height it was minimal I also checked the leadscrew height and lateral position at the same time and it was no longer bowed. This always has to be considered if you are restoring a lathe bed. If you decide to scrape the saddle to match a reground bed for a metal to metal line contact you have to machine the top of the apron or the underside of the saddle to correct the lead screw misalignment, and much harder… Correct the alignment between the rack and pinion that drives the saddle. Using epoxy bearing material you only need to jack it into position until all misalignment is corrected. The epoxy is replacing all the worn away material.

The jacks are the key…. You can take as long as you like to get the positioning right before you place the material, I set up the cross slide for normal running before adjusting the jacks, this allowed me to adjust the saddle relationship to the spindle axis as well.

After the epoxy was set the shrinkage across the tiny gap between the bed and the saddle is infinitesimal. I did not need to scrape the saddle in after the epoxy was set.

Regards
John

Edited By John McNamara on 28/04/2014 02:04:29

[John McNamaraParticipant @johnmcnamara74883]

Hi All

Using the epoxy method will not correct for a worn saddle rack and pinion drive.. doing so would put the leadscrew out of alignment. I was lucky the rack and pinion are hardened and showed negligible wear.

I tried to edit the post and insert this (Yes editing was available at the time) but the editor would not do it. there is a repeatable bug in the forum software…. if you edit a post more than once the second edit may or may not work. the workaround is to log completely out of the forum then log back again, and that of course subjects you to the interminable wait that this site; (unlike almost all the other engineering sites I visit….) gives you.

Regards
John

[egaParticipant @ega]

John McNamara:

Many thanks for the additional practical points which reminded me of the problems I faced when rebuilding my Super Seven. I had the bed professionally ground and remachined the saddle, etc myself. If I had had the advantage of knowing your method then I would certainly have considered it. I didn't record the amount of wear in my case but I doubt if it was as much as 2mm and I suppose that in your case the lathe had simply had a lot of use.

Someone commented on your Antipodean location which reminded me that the late J A Radford of New Zealand was an Araldite exponent.

[OuBallieParticipant @ouballie]

John,

Thanks for sharing your experience.

What release agent would you recommend using Araldite?

Wonder if I could have used this method to rescue that bronze worm gear I munched on my BH600G lathe?

Geoff – F(censored) wrong date for the dentist. Only two weeks too early! Ah well got me out walking and seeing GD, so not wasted.

[John McNamaraParticipant @johnmcnamara74883]

Hi OuBallie

Edit:

Hmm Maybe I should not have replied to this after two hours on the plane. I misread your post A worm gear is not a threaded rod!  Maybe epoxy would not stand up to the rolling and sliding tooth action you get with worm gears.

I am sorry I am so late in replying to your thread, I have been in Brisbane helping clear out a wonderful workshop that was set up by a family member. He was a fine mechanical engineer and gunsmith, He loved quality tools, Many times I sat in the shop with him. A workshop is not just hardware….. It represents a life's collected thoughts and aspirations. I will miss those good times.

Re the Epoxy composite nut.

For a release Agent You can use Carnauba wax applied as several layers each one buffed back, or proprietary release agent available form any outlet that sells fibreglass for boat or model building. The main thing is to get an even and thorough coating.

If you are casting around an old screw try to cast the nut at the point of least worn and largest diameter, Remember apart from the thickness of the release agent the nut will be a dead tight fit. It will bind if you cast it on the worn section when you move it to a thicker section.

The sample thread I did was encased in a steel jacket This makes the setup extremely rigid, I think it is a good method The piece of pipe I used was rough on the inside ideal as the epoxy will nit slip, maybe you could rough up the inside of your housing with a grinder or turn a couple of grooves or a shallow thread in it for a certain grip

When designing your replacement nut you could machine a block of steel to the same exterior dimensions and with the same mounting as your existing nut…Or a little bigger if there is room to give a little more room for the epoxy casting. If you can get it a 3 or 4 mm gap would be good.

You may even be able to set the steel block with its clearance hole allowing space around the threaded rod in its working position, that way you will be sure it is on centre. the threaded rod itself may need to be clamped in the correct centred location if it is not rigidly held in its bearings.

As mentioned in the PowerPoint presentation, I did my casting by first coating the thread then after that coat was tacky I inserted it in the piece of steel pipe and filled in the gap left by the first coat and the housing. This will assure the threads are fully formed.

Maybe you have a piece of whit or metric all thread you can experiment with first for a trial. You will find it is a fairly easy job.

Regards
John

Edited By John McNamara on 01/05/2014 17:01:58

[John McNamaraParticipant @johnmcnamara74883]

Hi Ega

You do not need to use Araldite, I have also used Megapoxy H From Vivacity engineering in Melbourne. Other experimenters have used West system often used by boat builders. I chose to do the test with Araldite because it is available worldwide.

Regards
John

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