Member postings for Jim C

Hi Dick H.

Many thanks for the photo and description of the motion work. I am making the clock to the old book and there seems to be some minor differences to yours. I can see from the photo the friction spring and can understand now how drive is brought about by having a square on the steel collet.(no mention of this in by book !!) am I correct in thinking then that the steel collet is glued to the centre arbor? And that tension is produced between the spring with a square hole in it and the washer at the end of the arbor?

I am grateful for your help with this and good luck with your question re the chapter ring.

Jim.

Hi to all makers of this clock or indeed anyone who has already completed one.

I am just in the throws of assembling the various wheels and pinions of the inners of the clock and could do with some help with the exterior motion work (hour and minute wheels) the book by John Wilding is a bit lacking in details of this assembly and whilst there are some good photographs on the forum a bit more advise and guidance wouldn't go amiss for me. This clock has truly been a challenge for me as a precision engineer but I am so close now.

many thanks in anticipation of much superior knowledge.

jim.

Hi There,

I have a Rishton mill which I think was based on the FB2 ?? It would be good to see the manual for the FB2 to see the similarities but a night class in German is not going to happen !!!! Jim.

Hi Jason and Martin.

Thanks for having a go at this. We do indeed get 12 teeth but only if we use a ratio of 12:1. But as Jason said, if we use the examiners ratio of 1:12 it is a massive number of teeth !!!!!

As I understand things, the ratio of 1:12 would indicate and input of 1 and an output of 12??

Thanks chaps.

I have been asked to post this question which is from a sample of questions relating to the topic of Mechanical Principles:

A compound gear train has input Gear A having 10 teeth, which drives Gear B having 36 teeth. Gears B and C are on the same shaft and Gear C drives Gear D, which has 40 teeth. Given the Velocity Ratio of the gear train is 1:12, determine the number of teeth on Gear C.

We can get the number of teeth on gear C but are confused about the ratio as written.

Thanks in anticipation of your thoughts. Jim.

Hi Carl,

We fitted a DRO to an M250 at college from Goodwin Technology Ltd. It was fitted by the workshop technician with no issues and had a very comprehensive fitting kit. Two years on and with student use, its still working fine. I have no connection with the company just a satisfied customer.

Jim.

Hi,

On the subject of Loctite. I have bought the pinions for this clock (not having made the lantern ones described in the build notes) and as a consequence they do not have shoulders for connection to their respective wheel. Do you think that Loctite will be adequate to fix the wheel and pinion to the arbor or will some pinning need to be done? (not much room in the pinion for this). Any suggestions gratefully received.

Thanks, Jim

Hi Alan,

just wondering if you have come across the website of Ian T Cobb ?

He can supply clock related parts. I have no connection only a satisfied customer.

looks like your clock is coming on well. I must return to mine when time allows !!!!

regards, Jim.

Hi Stephen. You must be very happy with the finished clock it looks great. I only hope I can finish mine to that standard. The photos will prove invaluable when I get back to the build. Hope you're open to one or two more questions as they arise. Cheers Jim.

Hi Alan and Stephen. Thanks for asking that question and for providing the photos. I too am well into the build of same clock. I was also somewhat confused regarding the assembly of the parts. Would I be right in thinking that the 3/32 inch arbors are reduced on the ends to fit into smaller holes in the two brass plates?? Any more advice would be gratefully received. Again thanks for the input. Jim.

On a Myford it is best to loosen the belt tensioning lever to allow easy rotation of the chuck and as Jason says, make sure the chuck is tight. Regarding setting the square bar true, I don't think there is a correct way. It depends on the accuracy you require. I usually use the edge of a hss lathe tool on the side of the square and then it's trial and error I'm afraid. If you've got lots of square work to do then you could invest in a self centering 4 jaw.

Hi Paul, I have a Rishton vertical mill which I am told was based on the FB2. I am looking for a manual for it to try and sort the backlash that exists in the Y axis. Therefore I would be interested in a copy of yours as the two machines do look rather similar when you look at them on the Lathes website. Thanks, Jim.

Morning Jon, that's exactly my machine. The one in the photo shows a hex top to the drawbar, only difference is that mine is domed. The domed nut on mine does not pass through the knurled collar (obviously !!) so I made a separate pushrod which has a top that does fit inside the knurled nut and it pushes out the morse taper when the knurled nut is wound down. Phew !! Hop you get that description. Thanks Jim.

Hi Steve,

Thanks for taking the time to reply. I think my machine is slightly different to yours but cheers for the advise. I have now sorted the problem by making a push bar which is acted on by the threaded collar to break the morse taper lock.

Hi All,

I think I may have a self ejecting drawbar on my Rishton vertical mill but am confused as to its operation. It's design consists of a screwed collar that screws onto the top of the spindle and of course the usual drawbar with top nut. So was wondering if someone could enlighten me as to its operation if indeed it is what I think it is ???? Many thanks in anticipation.

Jim.

Hi all. Having just purchased a Rishton 601 vertical mill, I would like to change the gearbox oil. Not having a manual for the machine, I am unsure what oil should be in there. Help with choosing the right grade would be much appreciated. Thanks, Jim.

Hey Jason,

Got some lazy apprentices at college that might find your formula for speed much more interesting than the heavy one I try to get them to use.

Strange that. Tried to order some 10 and 12 mm square for College before Easter and the local supplier could only get half inch square !!!!

Hi Nick,

Just done the calcs and come up with 169 rpm. Anywhere near what you were thinking?

Jim.

Gents. Thanks to you all, too numerous to name. You have provided me with a wealth of information with many great suggestion.

I need to do a bit of research now into those ideas. Many many thanks to you all. Cheers, Jim.