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Member postings for Pete Rimmer

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

Thread: VFD on a Boxford lathe
26/05/2019 10:36:45

How a person uses a VFD is a matter of preference of course but I find that one of the real benefits of being able to adjust the frequency is chip control. A small adjustment can mean the difference between stringy swarf birds-nesting around the chuck and little tiny curly chips making an easy to clean up pile in the chip tray.

I usually run them up to 100hz. As I see it, if you're running a 4-pole motor at double speed that's no different to running a 2-pole motor at normal speed, as far as the mechanicals are concerned.

Thread: Getting rid of the garage door...........
25/05/2019 08:45:01

Wall space is precious in a busy workshop IMO. Shelving and cupboards will store stuff on the wall that would otherwise be wasted space so I am firmly in the 'scrap the door and make a wall' camp. I don't have windows, just plenty of lighting. I have plenty of stuff in my workshop and all of it came through a single pedestrian door, albeit slightly wider than standard.

Thread: What are these change gears for?
24/05/2019 16:40:23

That's quite a valuable gear being similar pitch to Boxford. If you have no use for it then put it on eBay with a low start you might be pleasantly surprised at what it fetches.

Thread: Drilling cast iron - where did I go wrong?
16/05/2019 18:18:15

Pilot holes in anything - 1/4 to 1/3 the size of the next drill. For cast iron use slow speed and plenty of feed. If you're manually drilling on a drill press Keep up a decent pressure even if you're pecking, never let the drill turn without feeding.

Thread: Tail stock adjustment
11/05/2019 19:46:53

I agree with Martin check first that the headstock has no nod and do the same for the tailstock ram. If both the headstock spindle and tailstock ram prove to be parallel to the bed (and each other) then either shim the headstock or scrape the tailstock. 8 thou is a lot to scrape but not so bad on a small area like that. You could mill most of it and scrape the rest.

Thread: Determining the correct gear pitch for a given rack
07/05/2019 21:40:45

Yeah it could be that Michael, good call.

Thread: 7/8" x 5 tpi acme threaded rod
07/05/2019 20:58:18
Posted by ronan walsh on 07/05/2019 20:46:09:

The thread is right hand, which makes things slightly easier.

Course it is, the handle is on the front of the valve block which travels with the y-axis. I must have had a brainwarp earlier.

Thread: Determining the correct gear pitch for a given rack
07/05/2019 20:52:17

Set your digital caliper to 3.142 inches and offer it up to the rack teeth. If the jaws span a number of teeth exactly then count the teeth they span - that's the equivalent DP of the rack.

If the jaws don't span whole numbers of teeth then it's a module rack. Measure across ten teeth and divide the answer by 31.42.

Thread: 7/8" x 5 tpi acme threaded rod
07/05/2019 06:46:53

A cross-slide on any machine where the handle doesn't travel with the slide will be LH thread, unless it's geared.

Edited By Pete Rimmer on 07/05/2019 06:47:26

Thread: Larger VFD/Motors
06/05/2019 10:12:50

Compressors are notoriously hard on startup loads but a 1-1/2hp motor blowing 13a fuses with no load is very unusual. I'd be checking the supply voltage under load, might begetting a significant drop.

05/05/2019 23:13:04

Your average 13a fuse can carry MUCH more than 13amps.


Thread: Schaublin
03/05/2019 18:03:11

The Europeans I know (Finnish, mostly) say Show-blin, and they are all mad for them.

Thread: Machining a chuck backplate
03/05/2019 05:56:52

It's only a register so just a few mm would be fine Robin. 12.5mm is more than ample for the job.

Thread: Make new crossslide feed screw
02/05/2019 18:21:51

They are certainly a LH thread. The originals are 'modified square section' Which just means 5 degree flank angle so much more 'square' than ACME or Trapezoidal threads.

02/05/2019 13:57:25

The standard screw is either 1/2" OD x 10tpi or 2.5 mm pitch modified square section. There is absolutely no compulsion for you to follow that odd-ball convention though so a 12mm x 2.5 pitch is a good compromise.

Thread: Does anyone know where I can source a Myford 34t change gear?
01/05/2019 18:28:52

Thanks Bill.

I made 7 pairs since it was as easy to hob 7 as a single one once the machine's set up. They did go quickly so I've now removed the advert.


Thread: Dual speed motor on Hardinge HLV-H - Fast not working
01/05/2019 06:26:54

My HLV motor had two separate windings for fast and slow, I don't know if the HLV-H is the same but if it is I would inspect inside the motor junction box to see that none are loose or shorting to the frame. Mine was a Feltham machine with a Newman Industries motor on it, and had a wiring schematic on the inside cover of the motor.

Thread: Yaskawa VFD
30/04/2019 12:23:03

I have several machines with vfd up to 2.2kw and all of them are fitted with a 3 pin plug and 13 app fuse. None have ever blown the fuse nor tripped the 32a mcb in the panel.

Thread: From the ground up!
29/04/2019 21:34:57

Second from the right is a globe valve seat cutter.

Thread: Does anyone know where I can source a Myford 34t change gear?
29/04/2019 21:16:15
Posted by Adam Stevenson on 29/04/2019 18:13:03:

I don't think it matters who makes them, marypoppinsbag sold them on ebay and myford tried to get them banned but as it only stated they was Myford compatible no one owns the right to make them or sell them. When Lesley died JS sold them to RDG as well as the few direct customers. You are welcome to list the on HWS.

Thank you Adam, for that consideration. If remember John saying that they tried to get Lesley's advert pulled.

It wasn't my intention to get into wholesale, more to fill a need but if they continue to remain unavailable I may advertise some in the future. More than half of the above sets are already claimed.

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