Member postings for Ian Parkin

I had the need for a longer rack (2ft) for a large fobco drilling machine

I couldnt envisage what/how to do it with my workshop equipment

a local gear cutter wanted £300 or so to make it assuring me that it was absolutely critical that the tooth form was perfect and any inaccuracys would lead it it jamming wearing quickly

I think It was mr J.S who suggested cutting the teeth with my vertical mill and then setting the head over and then doing the angle

4 end mills later (3mm ones) i had cut straight down (100 teeth)

1st question what depth of cut and speed and feed should a 3mm endmill be able to cut in MS?

I tried setting over the head but it was giving a dreadfull finish as the bit was moving rather than cutting

So i bought a gear cutter suitable for a rack

Thinking of ways to use it maybe mount a motor and gearbox on the mill spindle or a right angle drive

Made an arbour out of 1" ms and mounted that in the lathe mounted my precut blank in the toolpost and gingerley fed into the cut....perfect 2 different heights on the toolpost and job done in 2 hours doing 5 teeth at a time before moving the blank in the toolpost

Cutter was spinning at 210 revs...

2nd Q is that about right for a gear cutter 3" diameter hss cutting MS?

This was as I progressed so I had the moving steady supporting the arbour

turned the blank around and changed set up for the ends

this the finished rack and the original which is only 10 "long and a sealey one I bought which worked fine but didnt look too good

And this is it installed in the machine

I've motorised the bed...absolute luxury

switch gear mounted in a moveable box if it gets in the way it can move

Edited By Ian Parkin on 06/04/2016 17:35:01

Very often inverters has a filter near the input connection

you can switch/unplug this

look in the book for instructions

if the filter is installed it will trip the rcd

http://www.chronos.ltd.uk/acatalog/info_C60JV125.html

Those holes in the video are very much like mine BUT i'm fairly sure that my holes are not put in after manufacture but as part of a pressing /moulding operation

I have absolutely no idea what they are for ...thats why I was asking never seen anything like this before

I have a total of 4 bench grinders and 1 TPG and have replaced wheels regularly as they get worn

AS I said in my OP they are moulded in and are nice round and flat bottomed

Chronos have confirmed thats how they are made..all their stock of these wheels is like that

I have brought it to their attention and they have said they are OK to use

Its a 5" small grinder I keep close to the lathe for touching up or modifying carbide bits

I know all grinders are dangerous but I would be more concerned with a 8" or larger machine

I'm sure that my wheel is as makers intended

I cant believe that any stone maker would risk the dangers of a stone exploding by drilling holes in it to stop cracks spreading especially on a £12 wheel

I'm sure as Chronos has said its part of the manufacturing process

are wheels moulded early in the process ? and the holes are from the mould for whichever reason

The wheel is definitately NOT cracked in any way

It rings and it runs true and works well on carbide ...the reason I bought it

You all did see the response i posted from the supplier?

My post after the second lot of pictures

Just had this in from Chronos

Some more photos and a blu tack impression of the holes

And the label which if its not clear is

1 125x13x31.75z 331556/ indistinct

C60 J6U

40 m/s mos-6110

Supplier was chronus so hopefully they will respond to my email pictures today

Right

I pulled it off to investigate more and its definitely not cracked it rings as a stone should

But theres another hole on the other side

these are nice clearly made holes 8mm dia perfectly round and flat bottomed 5mm deep

ones at 12 o clock and the others at 4 o clock on the other side

these are put in during manufacture

its a 125mm 13mm wide wheel and they are 32mm and 35 from the centre

I've contacted the supplier they asked for the pictures so we will see what they say

I bought a grren grit grinding wheel for a small grinder I had

after mounting it the blotter flapped out slightly showing a hole

is this ok? looks cast in

I've never seen a hole before on a stone

Its about 6mm deep perhaps 7-8mm dia

After ringing to order the part at clarke international it was out of stock however the chap said machine mart do have them in stock and gave me the number

It was actually only £18.79 all in delivered from there !!

Clarke international have just replied with a price of £24 all in delivered so not too bad

I had removed the spindle and it was on the vice drifting from the top so it was purely end force with the tapers pushing....I imagine that the chuck had never been out before and it may be rusted solid

I bought an old clarke metalworker drill press sans motor but otherwise looks fine over the weekend with the intention of converting it to a tapping stand

I had a geared motor 400rpm that i was going to put on and use it with a tapmatic head for tapping dutys rather than swapping out on pillar drill

Trying to get the chuck out however..one last tap with the lump hammer on the drift and

Anybody care to hazard a quess at how much from machine mart?

I have enquired

Edited By Ian Parkin on 15/03/2016 12:20:54

I have used these for my TPG

http://www.beltingonline.com/flat-belts-1065/

Bill

I use wd steels for mild steels in bar and flat

I use phoenix steels for silversteel and GFS

Where are you?

My local steel stockholder has bins of ends

and very cheap

but not for posting

Idealy it would be great if someones travelling up north on other business they can do it and i'll pay their petrol costs

I dont mind travelling and i'm going to have to go down soon to get it if no one can help