Member postings for SteveI

Clive,

That has helped. Thank you.

http://www.rotagriponline.com/datasheets/Bisonpage90.pdf

Thanks,

Steve

Edited By SteveI on 03/05/2016 19:28:21

Hi,

My guess is that you have a 100mm center height UTH. For the 125mm center height unit it has a MT5 internal taper and the outside external taper is something I would very much like to know!

I have been in contact with Hofmann and have always had a fast response but that specific question about the external taper has never been specifically answered. I would very much like to buy a chuck mounting back plate for it. The best I can find from the internet plus the documents they sent me was:

1. For both the 100mm and 125mm center height dividing heads a compatible chuck should be to "DIN 6350".

2. It is referred to as a "short taper". if memory serves me correctly I think that it is not camlock. D1-4 which would be the size of camlock D short taper suitable for a MT5 internal taper (D1-3 being too small) and D1-5 being larger than measured.) However I do not have my head to hand to measure.

Does anyone know what the correct reference for the external taper is? So I can buy a backplate to mount up a chuck. I did not know rotagrip had some of these in stock. I expect I would buy a backplate from them if they knew which I should buy. Has anyone asked them?

Thanks,

Steve

Well after a few hours I got it moving and now have the scroll clean and the internals accessed via the adjustment pinion reasonably clean. I gave up trying to take it apart. Fresh grease inside and now it is in use. Happily it is very accurate. Pratt Burnerd steel chucks are beautifully made. It is still very stiff with no slop whatsoever.

Steve

I recently obtained a Pratt Burnerd 6" 3 Jaw set-rite (4 adjusting screws at 90 deg) chuck Catalgoue No. 1219-00360. It is new old stock and was very gummed up with anti rust paper remains. It has apparently sat on the shelf since the early 1980's.

I have taken the jaws out and cleaned it as best I can. I understand that these are made to a tight tolerance but it is still very stiff. There is a grease nipple. I expect any grease inside will be congealed. I want to open it up and clean it and re-grease.

Does anyone have any advice or a copy of a maintenance sheet? Picture of rear inserted below and there is a front and side in my album.

Thanks,

Steve

Hi,

What other options are there for buying cast iron? Does anyone know where CES source from? Is it http://www.unitedcastbar.com whom I think are in Chesterfield?

Thanks,

Steve

Hi,

As an alternative option I decided to gamble on a second hand Hardinge sjogren 5CX speed chuck to avoid the potential quality issues with Chinese. The risk with this second hand auction site route was of course wear so I bought one listed as in vgc. I am happy to say it worked out for me. I had to strip it down and clean it and put new grease in it. Run out out is less than a tenth.

Steve

With a 4 1/2 MT in a D1-3 Camlock spindle you can take advantage of the bore through the spindle and also to provide enough space for 5C collets. For D1-4 you can do a 5 MT but there is not enough meat on the D1-3 for that. Surely you prefer that compromise over a MT4? Lots of D1-3 equipped lathes have this 4 1/2 MT taper. Reducing bushes to 3 MT come up from time to time on ebay.

Steve

Neil,

Although this discussion is now going off topic, I have noticed a number of articles of late in MEW with drawings that look to have been CAD based. So why are you not making them available?

Steve

Julian,

You are of course correct about the fact short comings are still present. Perhaps I should have been clearer there are some aspects that are visual improvements to a more prototypical look. E.g. the over sized LBSC boiler is replaced with a smaller boiler design. I acknowledge you know a lot more about this than me. I was simply trying to illustrate the point about their being variations of the pansy design available to a poster new to the hobby.

Steve

Hi Nick,

There is a thread over on the modeleng proboards forum about a "speedy" build. Over 4000+ posts and still going strong. The build is a metric conversion of the original design.

Perhaps take a look at the Hewson's website as they have a more prototypical pannier tank design based on the "pansy". Many improvements and the plans are available in digital dwg format. I have a set and they are superb. I won't share them as I have to respect a designer that is offering a design in a modern way. Rather than selling prints known to be full of errors. I only wish other designs were made available digitally. Furthermore there have been a number of the updated more modern boiler design in this model made by individuals and commercial boiler makers. The Hewson's offer items for this design to help you progress it.

Thanks,

Steve

Hi,

I use an A size on my 5 1/2" x 30 lathe. I bought it second hand. An original multifix (swiss made) tool post with an assortment of tool holders, some swiss, some west gerrman, some german, some french and some chinese. Their is a fair bit of commentary around the internet that recommends to get a swiss or german tool post and then source from wherever you get chance for the tool holders. I am not aware that the create make either the internal or external screw cutting tool holders although they do make blanks which I like.

I don't have a myford but I have seen them and I couldn't imagine the A size being the right size. Aa is the correct choice. It can be confusing to find the country of origin of the various compatible offers. Don't quote me but here are my thoughts:

Create, Pewe tools are chinese made. The create A size parting tool holders are rubbish as they don't hold the blade at the correct angle. The regular AD are ok but the corners of the tool holder are not relieved.

Amestra ("original" multifix) french made. i have some of the Amestra AJ bar holders. Really nice up their with the German.

Original Swiss made all have swiss or suisse on them and are everything they need to be.

AXA (German) are very nice and available from amazon.de.

For all these I suggest keeping an eye on ebay.de.

Regards

Steve

the tail stock and the mounting casting for the taper setting assembly are not visible in the pictures. So I am not sure how it could be used as is without at least making a mount for the taper setting assembly.

For completeness there was a unit for the MKIII as well. I'd imagine that is like hen's teeth.

Steve

Do you have any reference to back any or part of that up?

Steve

Almost all the MKI and MKII standard tooling is the same or interchangeable. MKIII tooling is larger.

Steve

Hi,

I am trying to obtain a manual for a Dowding & Doll v4 gear hobber. I have managed to get a partial copy for a v8 and another partial copy for a v10. Does anyone know of a source?

I know lathes.co.uk have one but its rather expensive.

Thanks,

Steve

Hi,

Well I've learned a lot from the responses, but I have not got to the point where I can order up something that is listed on a hobby suppliers or other site as it seems they don't give the full specification of the wheel.

This is what I have today and I expect that I want to get a D9 version of this D76 wheel

E= 10mm, D=150mm, W= 10.5mm (ideally this can be much wider), H=63.5mm | 2.5" (not critical as I can bore it out), T= 38.4mm, x=3.25mm

Failing another option on Monday I will ask for a quote for a special "D9" version from http://www.abtec4abrasives.com but there must be something close as a standard product thats easy to buy. All hints appreicated.

Steve

Edited By SteveI on 25/07/2015 15:55:10

Hi,

There are plenty of 5" options about. In addition to the references above Machine spares sell appropriate dish and cup white wheels direct and also via ebay.

If you use a raising block to accommodate a 6" wheel, won't your tooling and work piece be at the incorrect height and need raising? I think the MKIII has a 6" wheel and the tooling for that is all larger. Please educate me if I am wrong.

Thanks,

Steve

Hi,

Thanks for the information. Does any one have a reference to the diamond wheel numbering system?

Thanks,

Steve

Hi,

I have been looking for a cheapish solution for initial radiusing and touching up carbide scraper blades. This is the system I've seen in use and its very very good for this task.

http://accu-finish.com/product-category/finish

Thats too expensive so I picked up what google tells me is an RJH Ferret "wet" grinder off of a popular auction site. I got lucky and the motor was easily changed to 240V 3 phase and coupled with a second hand VFD I am in business. I can run it nice and slow perfect for the task.

It came with a 6" diamond cup wheel, (with a 2.5" bore" for mounting). The wheel is etched with:

MARCON

D76-C50-3

R113 2928

Trouble is the wheel is good for (very quick) roughing out the radius on the blanks but its far too rough for touch up. So am looking for a 600 / 800 or 1200 grit alternative.

A quick google and I am guessing Marcon is "Marcon Diamond Products" in Hitchin. Unfortunately the telephone number (01438 820581) is unanswered. Are they still in business?

So does anyone have any suggestions for a suitable supplier of diamond wheels? RDGTools / Arc etc etc don't list the grit sizes for their diamond wheels. I am guessing that they will also be a bit rough for this specific task.

Thanks,

Steve

Edited By SteveI on 21/07/2015 22:03:53

Hi,

Thanks for posting the update. I have a PD8 with a problem it is stuck in back gear and the high speeds wont engage.

Steve