Thermal Dynamics Cutmaster 70+
#17 in Over 45 AFull review
A 70 A cutter for farms and fabrication shops that cut thick plate and want a CNC-ready machine. Home shops cutting under 3/4 in can buy smaller.
Amazon $3,485$3,485
3.3/5
A cheap 50 A pilot arc cutter for hobbyists cutting sheet and steel up to 1/2 in now and then. Its short duty cycle and high-frequency start make it a poor fit for heavy or CNC work.
- 50 AOutput
- 1/2 inRated cut
- 20% at 50 ADuty cycle
- 120/240 VInput
Check price at Amazon$198.90
Price checked November 2, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Cuts 1/2 in steel cleanly on 240 V and plugs into a household outlet for sheet metal
- Pilot arc starts on rusty, painted and mesh metal without touching the torch down
- 2T/4T trigger modes and adjustable pilot and post-flow times for long cuts
- Low price for a dual voltage pilot arc cutter
Cons
- High-frequency start can upset nearby electronics and CNC controllers
- Rated plate duty cycle is only 20% at full output
- Manual asks for 95 psi air, more than small compressors sustain
- No warranty term published
How it scores
The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
Specifications
| Model number | CUT-50 (high frequency, 2T/4T) |
|---|---|
| Cutting | |
| Input voltage | 120/240 V |
| Maximum output | 50 A |
| Rated cut, mild steel | 1/2 in |
| Sever cut, mild steel | 5/8 in |
| Rated duty cycle | 20% at 50 A |
| Pilot arc | Yes |
| Arc start | High frequency |
| Air and build | |
| Air supply | 95 psi |
| CNC port | No |
| Weight | 19.4 lb |
Alternatives in this size
PrimeWeld CUT50
#18 in Over 45 AFull review
For a hobbyist who cuts clean steel up to 1/2 in now and then and wants the lowest price. Spend more on a pilot arc model for rusty or expanded metal.
Amazon $289$289
Miller Spectrum 875
#20 in Over 45 AFull review
A 60 A shop cutter for farms and fabricators who cut thick plate often and want Miller build and service. Home users who cut mostly sheet and 1/4 in steel do not need this much machine.
Cyberweld $3,917$3,917
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