Largest Manufacturing Technology Community on the Web
Stay Connected:
Search results
-
M
I need a 6" LH 3/8-16 tap.
Boosted...thankyou. I didn't run across that company in my search. Seems like a larger counter bore is required for the extension's clearance but these would be helpful in many cases. Thanks for the silver solder recommendation. I have silver solder of course, but rarely use it for some... -
M
I need a 6" LH 3/8-16 tap.
Here's an odd ball question. As the title says, I need a long LH thread 3/8-16 tap. I can't find one. I tried modifying an existing tap by welding an extension (TIG, MIG, various cooling techniques), but it didn't work as the weld site was always too brittle. I don't have the capacity to... -
M
Newall scale bent, advice needed
Thanks for the replies everyone. The scale is not kinked, it's a smooth arc. I will clamp the scale in a couple v-blocks and apply pressure to the peak of the arc use something cut to the same length as the read head. Then I'll proceed with the advice given to test and measure. -
M
Newall scale bent, advice needed
I have 3 mills but one doesn't have a DRO. I've had a Newall kit for a while and finally found time today to install the kit. This kit has a knee scale for Z (as opposed to the more typical quill scale). We were almost through with the installation and, unfortunately, let our guard down and... -
M
Phase Conversion Only
JST: While on the topic of capacitors, I have a question...do they deteriorate with age if NOT used (i.e., not powered)? For example, is the main cause of failure, over time, heat cycling or something else (e.g., age related deterioration of internal materials whether powered or not). This...- marrt
- Post #22
- Forum: Transformers, Phase Converters and VFD
-
M
Phase Conversion Only
mksj and JST, thank you for the comments. I understand the issue much better as your posts complement nicely. Recommended cycle times of 5 minutes (as one example) enable the inrush control circuit to "reset" essentially. This reduces the heat damage caused over time by frequent large current...- marrt
- Post #20
- Forum: Transformers, Phase Converters and VFD
-
M
Phase Conversion Only
Overland, thank you for the post. Those Fuji's are certainly affordable. In my case, a RPC is the way to go because I already own a “15 HP” American Rotary and I don’t want to rewire the lathe control panel. If driving the motor only, the VFD would be the way to go.- marrt
- Post #17
- Forum: Transformers, Phase Converters and VFD
-
M
Phase Conversion Only
thermite: "Can work. But AFAIK, the main reason -> VFD -> VFD is not often done is that there is seldom any NEED to do, nor any significant gain, even if you throw 'extra' money and clever configuration settings at it." True. But times, they are a changin’. I have 5 or 6 VFDs in my shop, all...- marrt
- Post #16
- Forum: Transformers, Phase Converters and VFD
-
M
Phase Conversion Only
JST: What is "frequent"? My question was open ended because I’m curious as to what is acceptable (what is the design spec). Frankly, if it’s an issue, it should be stated in the manual. I called Phase Perfect and asked this power cycling question. They said it’s fine to cycle their inverter...- marrt
- Post #15
- Forum: Transformers, Phase Converters and VFD
-
M
Phase Conversion Only
jim rozen: "Is there a specific manufacturer's statement in the manual to avoid shutting the machine off when not in use, or is this anecdotal from the internet?" Good question and I wondered that myself. I looked and couldn't find anything definitive. Only a warning to avoid disconnecting...- marrt
- Post #14
- Forum: Transformers, Phase Converters and VFD
-
M
Phase Conversion Only
thermite: "the drop in annoyance is well worth remoting the buggers" Mm-hmm. What if I told you I relocated the idler to its present location, to reduce noise, just before I decided to make that location my office...due to "unforeseen" circumstances of course. I could start a whole thread...- marrt
- Post #8
- Forum: Transformers, Phase Converters and VFD
-
M
Phase Conversion Only
thermite: "In my wurld, that means not only fewer than 8 hours a day, but often long stretches with NO use AT ALL," Exactly correct. This machine may be used several times a day for several days, then not used again for a month. Power to the VFD comes from a master power switch on the lathe...- marrt
- Post #7
- Forum: Transformers, Phase Converters and VFD
-
M
Phase Conversion Only
Apologies for posting this in the wrong forum initially (moved here by a Mod I assume). I did look for the proper forum but I just missed it. Crickets: I was under the impression static phase converters are not well designed and probably won't work with a VFD expecting a clean waveform. I'll...- marrt
- Post #6
- Forum: Transformers, Phase Converters and VFD
-
M
Phase Conversion Only
I have a 5 HP 3-phase manual lathe. The lathe includes a 3-phase input VFD for variable speed control. The lathe also includes two other 3-phase motors for oil circulation and coolant. I don't have 3-phase power available at my location. I use phase converting VFDs to drive my other 3-phase...- marrt
- Thread
- Replies: 21
- Forum: Transformers, Phase Converters and VFD
-
M
Bearings rough after new install on Roll-in saw
Sorry for the delay getting back to this issue. Been too busy lately. I measured the size of one hole in the guide and it's exactly 2 thou undersize. However, this hole was already related to the "smoothest" running bearing of the four. Earlier, I pressed new bearings into the guide with the... -
M
Bearings rough after new install on Roll-in saw
The bearings did turn smoothly before installation. I did not measure anything before installation. I called Roll In and discussed the issue with them. They were stumped too. They press the bearing on to the blade guide, then press that assembly into the guide housing. This obviously... -
M
Bearings rough after new install on Roll-in saw
Not a bad idea. I do have another set of bearings. Maybe wrap the housing in Aluminum foil and heat up in a toaster oven to 250 or so. Might be worth the time just to see if the bearings really are damaged. I usually don't bother to heat anything when installing bearings because I can press... -
M
Bearings rough after new install on Roll-in saw
I installed new blade guide bearings on my Roll-in saw. The blade guide (roller) and bearing is pushed out the back of the assembly via a small access hole. Otherwise, the bearing sits in a blind hole. On install, I pushed the bearing on to the blade guide shaft first, applying pressure... -
M
Rockwell carbide grinder parts for sale
Any chance you have the miter gauge? Of course, I don't need a miter gauge to sharpen bits. However, my Rockwell is very nice and I wouldn't mind having a miter gauge to make it look "complete."- marrt
- Post #5
- Forum: Tooling, Parts and Accessories For Sale or Wanted
-
M
Tapping cast iron, 1.5x bolt dia. good enough for thread engagement?
All...thanks for the replies.