Member postings for mike robinson 2

They seem to offer a set of spare parts for the governer here https://www.stuartmodels.com/product/stuart-governor/

I am sure a phone call or email will give you the info you need

Looks like a Stuart No 9, this is mine...

Hi Ian, as above I downloaded the 3D model of the stepper end cover from here **LINK** this link will give you the available design options then I uploaded to a 3D printing service to generate the model. You can search for such services but here are links to 2 of them https://www.3dpeople.uk/ and https://www.hubs.com/3d-printing/united-kingdom/

Hope that helps

Ian, thanks for the motivation. I will give it a shot and see what Neil thinks.

Thanks to all for the comments.

The controller is from Steve Ward here https://www.worldofward.com/ You can buy a kit or purchase ready made. There is a download section for manuals etc if you wanted to take a look at some of the details. The controller includes a adjustable setting to take into account any backlash.

The black finish is just satin black spray paint on top of a base coat of Upol #8 acid etch primer.

I don't have any drawings beyond my initial design but I will clean them up,check them and will re-post here when available. I am not sure how to share them so your suggestions appreciated.....

The 6 inch mounting plate is 0.8” thick and has 1 central 6mm reamed hole ½” deep (so a dowel wont fall right through) and 42 M6 tapped holes, 2 groups of 12 on 2 different PCD’s, the inner ring of which matches the Pratt Burnerd chuck mounting. The remaining holes are in a grid pattern. The 3 chuck location blocks were doweled in place and the chuck location register diameter machined in situ. This does not necessarily provide centre precision but does provide repeatability for relocating the chuck assuming the adaptor plate has not been removed. Centre accuracy measured at the chuck mounted 5/8" dowel pin was .0002” total indicated runout.

A few examples of the work for my Bolton Marine triple are included. The rotary table together with the DRO fitted to my Tom Senior E type mill (see other album) helps me be both precise and confident enough not to have to mark one part from another. As for speed, a few seconds for an index and your back to drilling another hole.

Profiling and stub drilling centres on the High pressure lower cylinder cover

Low and Intermediate cylinder casting, note the cylinder bleed holes which are angled that exit 3/64" from the cylinder face.

Lower cylinder covers and tooling sleeves to prvent damage to the LG2 bronze

7BA (overlength) test studs fitted

Tapping High Pressure cylinder stud holes 7 BA

Having used my 6 inch Vertex rotary for 2 years I wanted to find a better way to mount a chuck that didn’t consume unnecessary Z axis height and with the chuck removed also provide a platform for workholding that was more flexible than just 3 T slots. That went one step further (pun intended) with a desire to speed up manual operation. This is the result, which is as compact as I could achieve and prevents the often-seen massive overhang of the stepper motor hanging off an adaptor tube of some sort. The stepper driver and division controller is from Steve at World of Ward which gives increments down to .01 degrees with standard stepper driver settings.

The design uses an inner sleeve over the existing indexing spindle housing and is located by 3 grub screws that conveniently fit into the existing machined recess in the housing. A slim profile NSK ball race with metal shields provides swarf protection without the drag of rubber seals and which supports an outer sleeve onto which a toothed belt pully is mounted which is fixed by 2 grub screws, these locate into matching dimples in the outer sleeve. The bearing takes about 80% of the small belt pre-tension load, the remaining small radial load is taken by the worm spindle. The drive from the outer sleeve to the worm spindle uses the same keyway as would normally be used to locate the standard indexing handle and the sleeve is located axially using the existing handle hex cap head screw and washer.

I have a strong dislike for unprotected wires as seen on many projects with stepper motors. By chance I found an existing 3D model for Nema 23 size motors that was downloaded for free and sent to a 3D printer bureau. This link will give you a choice of end covers and with a lock type multi-pin connector the electrical connection is robust and can be easily disconnected. **LINK**

After a lot of usage for indexing by degrees and divisions and also for accurate profiling I am pleased with how it all works and would like to thank Steve Ward for all his help with the initial set up.

Edited By mike robinson 2 on 09/01/2023 11:1

I use one of these wheels from Arc on my Quorn, either 80 or 100mm dia. both are 18mm bore and either 10 or 15mm wide. Cool cutting and no runout

They have a nice wide face with cross sectional features that minimise tool setting changes

https://www.arceurotrade.co.uk/Catalogue/Machines-Accessories/End-Mill-Re-Sharpening-Module/EMG-12-End-Mill-Re-Sharpening-Module

Edited By mike robinson 2 on 21/11/2022 17:35:36

here you go

PS: I fitted mine about 6 years ago when it was about £300

My Velocette Venon Clubman (1960) also had the same problem even after a magneto rewind. Going to electronic ignition is fine but it does put a strain on the dynamo and usually requires that upgrading plus a larger battery. In the end I replaced the electronics with a new BTH Mag. It looks pretty much like a K1F but has a series of (maybe 8) radial high power magnets and coils that then feed a separate coil. The spark is very strong. It has built in electronic advance and retard and a setting pin to lock the rotor in postion when tightening the mag retianing nut. More in keeping and no reliance on the battery. In getting this link I just checked the price and its a shocker, its £660inc VAT https://www.bt-h.biz/BT-H-Magnetos/

referring to IanT's comments about Siemens Solid Edge it might be interesting for some to know the 3D parametric and synchronous technology modeller used within Solid Edge and also Siemens NX is Siemens Parasolid which is developed in Cambridge (UK). Parasolid is licensed to their competitors and partners for integration as the core modeller in other products including Onshape, TopSolid, SolidWorks, SurfCAM, Delcam, Bentley and Autodesk to name just a few.

I just googled "wooden hammer handles" and got matches with Zoro, tradecounterdirect and even Amazon. Most seem to be Hickory.

In fact the possesion of blank rounds, empty caes and projectiles are illegal as these can be re-purposed and re-used. I recommend the thread is dropped.

Thought I would share this in case anyone else is thinking about fitting DRO to their Tom Senior E type mill. I hope it helps.

Special double ended tool with 5mm drill and one end and removable 6mm tap at the other. Avoids horrible mistakes and keeps drilling and tapping vertical.

Just enough room to get the centre and rear holes completed.

Fitting homemade reader head brackets which started out as ¼” x 2¼ alloy angle, machines to squareness. The holes M6 holes in the Y slide were marked up on the surface plate and drilled on the bench drill.

Reader head cover fitted and designed to stop oil from the X slideways getting near the reader head.

The X axis slide reader head fitted. The X axis travel stops need to be removed from the front of the slide but it can all go back as it was originally if needed.

Keeping the readout cables tidy and out of the swarf.

And at the back too, no dragging the cables through swarf and eventually all 3 axis cables hang on a wall mounted hook.

A new design of quill stop plate was designed in CAD with a left side extension to support the Z axis reader head and manufactured by high pressure water cutting.

The DRO kit was for 2 axis but I purchased a 3 axis console and the magnetic strip that was left over from the Y axis was bonded to the pre-milled parallel recess in the machine head. There it is, 3 axis DRO and painted in Tom Senior semi-gloss green so it does not look too out of place. DRO has really transformed the mill! No tedious calcs to account for the .005” feed screw backlash and totally precise parts to within 3-4 tenths of a thou with trying too hard.

Crazy times, crazy week. Apologies for taking so long to upload the photo showing a much better surface finish when using a HSS toolbit Vs insert tooling (which has never been an issue before)

Least I am back on track and 2 more to go....

Thanks again for all the advice.

Firstly many thanks to everyone for taking the time to respond. I have used a lathe since I was 16 as an engineering apprentice and I am 66 now. New things are not always better and the great news is a sharp HSS tool has solved the problem. The surface finish is good and smooth (flat) even on the interrupted cut.

Perhaps I should have added at the start, my Super 7 was a fully re-furbished machine from Myford about 3 years ago, the lead screw is good, the cross slide feedscrew is new and cross and top slides are set well. I was able to complete by Quorn grinder without any issues.

The insert by the way was from JB Cutting tools with a brand name of "TaeguTec" ,and I have never had an issue before, seems bronze is more troublesome than I remember. I will try to post a picture of the HSS test cuts shortly

Thanks again to all for the support !

Mike

I am machining bronze castings for the Bolton Marine triple expansion. Normally I can achieve good quality surface finishes using insert tooling (DCGT 070202 FL K10). The parts I am machining now are the 3 lower covers.

For a reason I cannot determine the face surface finish has ripples about .125" apart with a depth of .00025" using a .003" cut. As the photo shows there is an interrupted cut. The insert is new and the "sound" of cutting is good and the top slide and carriage are both locked when cutting. The cross side is set correctly. I have power cross feed on my Super Seven and first thought that was the source given the regularity of the ripples, even if I had very successfully skimmed my face plate with automatic feed.

I repeated the process and used manual cross feed and that result is what you see in the photo. I have never Any suggestions for understanding the cause and solving this problem is very welcome.

(PS: I have not tried a standard HSS tool bit as yet.

Thanks

Thanks for the responses, I will measure the backlash over the weekend and post my findings for your opinions. I might explore whats behind the knurled nut too..... thanks

I have been lucky enough to find a Tom Senior S type 6" rotary table in very good condition, other then a bit of backlash which I would like to adjust. I cant find any user manual but the knurled knob on the right side, when undone seems to slacken up the engagement of the worm, but when tightened still doesn't remove the backlash. I guess given its age it's understandable.

here is the link to a photo in my album, but I could not manage to upload the photo without its orientation changing

https://www.model-engineer.co.uk/albums/member_photo.asp?a=49073&p=811742

Any guidance on adjusting the backlash very welcome, a photo of my rebuilt Tom Senior Model E is in the same album, also with a bad orientation

Mike