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Member postings for Martin Connelly

Here is a list of all the postings Martin Connelly has made in our forums. Click on a thread name to jump to the thread.

Thread: Stainless Steel Metric Fasteners
20/04/2019 17:32:12

I have bought them for work in the past from RS or Buck and Hickman. Not necessarily the cheapest but RS always delivered next working day so suited urgent requirements.

Martin C

Thread: Backlash
20/04/2019 17:27:26

Typical method for CNC is to set up a dial indicator. Move towards the indicator until it moves a suitable amount to be sure it is off its stop and set it to read zero. This is the zero position. Reverse away from the indicator and back to zero to check zero is correctly set on the indicator, repeat as necessary.

Move forward another mm or other suitable distance to ensure the indicator moves away from zero then back to the zero position. The difference on the indicator from zero is the backlash value. If you can't enter this value into your program then calculate the number of steps to move this distance and add them to the reverse move.

Repeat the above with the backlash compensation and check the indicator returns to zero when the reverse move is made.

It is probably a good idea to reverse the direction and check backlash from the other way as well.

Martin C

Thread: Gyroscope origins
17/04/2019 08:23:45

Link?

Martin C

Thread: Telescopic bore gauges
17/04/2019 08:20:34

I agree with the two earlier posts regarding dial bore gauges. Yes they are fiddly to set up and to some extent use, it is also possible to misread them. They do however give repeatable results that do not rely on good feel. Cheap telescoping gauges can feel like they need stripping and polishing inside to improve them.

If you need to bore pockets for bearings the dial type may be a good choice for you. As also stated above it depends on a lot of factors to make the decision of what is best for your current needs. When a lot of similar sized holes are required a three point micrometer bore gauge with checking and setting ring may be useful but this tends to be for industrial quantities.

Martin C

Thread: Smart and brown lathe
15/04/2019 18:42:41

Join the two previous posts and you've got a model m that belonged to the Atomic Energy Authority.

Martin C

img_20190415_183559.jpg

Edited By Martin Connelly on 15/04/2019 18:43:15

Thread: Removing a grub screw
15/04/2019 18:33:10

If it is in a through hole then a right hand drill may catch and drive it out of the hub.

Martin C

Thread: A close shave or why safety glasses are a must
10/04/2019 10:34:00

Two incidents come to mind from work. I was about to drill a small hole in a stainless nut for locking wire. I asked a nearby workmate to put his glasses on but he was reluctant so I insisted and wouldn't start until he did. Once started (using a high revving pneumatic drill) at some point the small drill disintegrated and a piece hit the workmate just below his glasses on his cheek. He thanked me for insisting on tbe glasses.

Another workmate was releasing a luggage elastic from something and it slipped from his hand. Tbe end swung around the structure it was on and hit the centre of one lens of his safety glasses with enough force to knock them back and cut his eyebrow area. Blinking would not have helped there.

Martin C

Thread: Further Adventures with the Sieg KX3 & KX1
10/04/2019 10:19:58

A simple but effective way to set z height is with a ground dowel, 10mm for example. You manually lower the tool to about 9mm above the surface you want to be z=0. You then creep up the z axis until the dowel just fits under the tool and set z=10 (or whatever your dowel is). A bit more time consuming than a tool setting switch but if you have plenty of time but money is tight it is an option.

Martin C

Thread: What Did You Do Today 2019
08/04/2019 20:40:43

Helped my wife's uncle sell his lathe today. 

img_20190408_111550.jpg

Martin C 

Edited By Martin Connelly on 08/04/2019 20:42:58

Thread: Slot Drills
08/04/2019 20:33:41

Broaching cutters can cope with half a hole as described as the centre slug effectively pilots the cutter. Too expensive for a one off job though.

Martin C

Thread: No 20 machine oil
08/04/2019 20:23:47

And this is the lathe.

img_20190408_111550.jpg

The mill is in the vehicle pulling the trailer.

Martin C

Thread: Please help machining
01/04/2019 19:33:09

You can cut the grooves with a suitable radius ball nose cutter and the work piece supported along its length. Turning the part through 120 degrees can be done in numerous ways. You probably need a hardenable steel but that is also not a problem.

Martin C

01/04/2019 19:19:15

Looks straightforward. If someone said impossible it must have been followed by a modifying comment such as "for no cost" or "at a price you will pay" . Were these professional machine shops?

Martin C

Thread: Chester 626 and Warco VMC spindle size
31/03/2019 23:36:01

This has been stated numerous times but let's say it again, the tang does not drive a morse taoer drill, it is for ejection purposes only.

Martin C

Thread: Advice on chuck modification
31/03/2019 00:06:02

Are you talking about a step chuck?

Martin C

Thread: On/off at the top with red green lights. What edge finder I?
23/03/2019 18:59:35

I think Tony P got it with z axis setting. Try the micrometer as suggested by. Michael G and see what repeatability is like (when it is working again) .

Martin C

Thread: Aircraft General Discussion
19/03/2019 18:34:03

I saw one of the new f35 fighters doing a practice approach yesterday. Good roar as it put on the power to go around.

Martin C

Thread: Toolroom lathe?
19/03/2019 18:25:58

Smart and Brown model m has 4" centre line to bed height, 6.75" width across the bed and the carriage is 11" long along the bed. Looking at some of the more modern offerings with a larger centre line height I suspect they have proportions that are relatively smaller than this. It also has large bearing surfaces in contact with the ways and the tailstock runs on different bearing surfaces than the carriage.

Maybe if turning between centres having dedicated ways for the tailstock means that wear of the carriage ways will have very little effect on accuracy. Maybe this is a reason this lathe is referred to as a tool room lathe. It also weighs in at 750kg when on its cast iron/steel base.

Martin C

Thread: Cutting a concave radius on the end of a round bar
19/03/2019 18:02:23

Rotabroach mini cutters go down to 6mm. They mount on an arbor that can be held in a chuck or collet. Part numbers for mini cutters start RCM arbors are RA116 or RA118 (the latter for cutters over 20mm up to 25mm diameter) . I find them useful for counter boring for cap head screws amongst other uses.

Martin C

Thread: Removing large flange nuts
15/03/2019 18:31:14

Here is one I made for a similar nut. Don't know what size your nut is but this tool will not damage the nut and is less likely to slip than a hook wrench. This is what the earlier posts were refering to as modified sockets which is one way of making this tool.

img_20190315_182041.jpg

Martin C

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